91017738502944 has 96 divisors (see below), whose sum is σ = 261603484047360. Its totient is φ = 27479357395200.

The previous prime is 91017738502919. The next prime is 91017738502949. The reversal of 91017738502944 is 44920583771019.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91017738502949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158737884 + ... + 159310235.

It is an arithmetic number, because the mean of its divisors is an integer number (2725036292160).

Almost surely, 2^{91017738502944} is an apocalyptic number.

It is an amenable number.

91017738502944 is an abundant number, since it is smaller than the sum of its proper divisors (170585745544416).

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

91017738502944 is a wasteful number, since it uses less digits than its factorization.

91017738502944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318048414 (or 318048406 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 91017738502944 in words is "ninety-one trillion, seventeen billion, seven hundred thirty-eight million, five hundred two thousand, nine hundred forty-four".