Exploring fully heavy scalar tetraquarks <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>Q</mml:mi><mml:mi>Q</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>Q</mml:mi></mml:mrow><mml:mo>‾</mml:mo></mml:mover><mml:mover accent="true"><mml:mrow><mml:mi>Q</mml:mi></mml:mrow><mml:mo>‾</mml:mo></mml:mover></mml:math>

The masses, current couplings and widths of the fully heavy scalar tetraquarks $X_{\mathrm{4Q}}=QQ\overline{Q}\overline{Q}$, $Q=c, b$ are calculated by modeling them as four-quark systems composed axial-vector diquark antidiquark. masses $m^{(\prime)}$ $ f^{(\prime)}$ these computed in context QCD sum rule method taking into account a nonperturbative term proportional to gluon condensate $\langle \alpha _{s}G^{2}/ \pi \rangle$. Results obtained for $m=(6570 \pm 55)~\mathrm{MeV}$ $m^{\prime}=(18540 50)~\mathrm{MeV }$ used fix kinematically allowed decay channels states. It turns out that, processes $X_{\mathrm{4c}}\rightarrow J/\psi $, $X_{ \mathrm{4c}}\rightarrow \eta _{c}\eta _{c}$, _{c}\chi _{c1}(1P)$ possible modes $X_{\mathrm{4c}}$. Partial evaluated means $g_{i}, i=1,2,3$ which describe strong interactions tetraquark $X_{\mathrm{4c}}$ mesons at relevant vertices. $g_{i}$ extracted from three-point rules extrapolating corresponding form factors g_{i}(Q^2) mass-shell final meson. mass $X_{\mathrm{4b}}$ is below $\eta_b \eta_b$ \Upsilon(1S)\Upsilon(1S)$ thresholds, therefore strong-interaction stable particle. Comparing $\Gamma _{\mathrm{4c}}=(110 21)~\mathrm{MeV}$ with parameters structures observed LHCb, ATLAS CMS collaborations, we interpret X_{4c}$ resonance $X(6600)$ reported CMS. Comparisons made other theoretical predictions.