9999767651551 has 2 divisors, whose sum is σ = 9999767651552. Its totient is φ = 9999767651550.

The previous prime is 9999767651431. The next prime is 9999767651591. The reversal of 9999767651551 is 1551567679999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999767651551 - 2²³ = 9999759262943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999767651591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999883825775 + 4999883825776.

It is an arithmetic number, because the mean of its divisors is an integer number (4999883825776).

Almost surely, 2^{9999767651551} is an apocalyptic number.

9999767651551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999767651551 is an equidigital number, since it uses as much as digits as its factorization.

9999767651551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1446700500, while the sum is 79.

The spelling of 9999767651551 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred sixty-seven million, six hundred fifty-one thousand, five hundred fifty-one".