91974554064 has 60 divisors (see below), whose sum is σ = 257893382656. Its totient is φ = 30599539776.

The previous prime is 91974554047. The next prime is 91974554143. The reversal of 91974554064 is 46045547919.

91974554064 is a `hidden beast` number, since 9 + 1 + 97 + 4 + 5 + 540 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 91974554064.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 535312 + ... + 685935.

Almost surely, 2^91974554064 is an apocalyptic number.

It is an amenable number.

91974554064 is an abundant number, since it is smaller than the sum of its proper divisors (165918828592).

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

91974554064 is a wasteful number, since it uses less digits than its factorization.

91974554064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221784 (or 1221775 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 91974554064 in words is "ninety-one billion, nine hundred seventy-four million, five hundred fifty-four thousand, sixty-four".