91502643568 has 90 divisors (see below), whose sum is σ = 205364588712. Its totient is φ = 38689948800.

The previous prime is 91502643563. The next prime is 91502643581. The reversal of 91502643568 is 86534620519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91502643563) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 323330755 + ... + 323331037.

Almost surely, 2^91502643568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91502643568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102682294356).

91502643568 is an abundant number, since it is smaller than the sum of its proper divisors (113861945144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91502643568 is an equidigital number, since it uses as much as digits as its factorization.

91502643568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 91502643568 in words is "ninety-one billion, five hundred two million, six hundred forty-three thousand, five hundred sixty-eight".