91539569664 has 264 divisors, whose sum is σ = 282974135808. Its totient is φ = 29526405120.

The previous prime is 91539569659. The next prime is 91539569687. The reversal of 91539569664 is 46696593519.

91539569664 is a `hidden beast` number, since 9 + 1 + 5 + 3 + 9 + 569 + 6 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7707859 + ... + 7719725.

Almost surely, 2^91539569664 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 91539569664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141487067904).

91539569664 is an abundant number, since it is smaller than the sum of its proper divisors (191434566144).

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

91539569664 is a wasteful number, since it uses less digits than its factorization.

91539569664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11933 (or 11903 counting only the distinct ones).

The product of its digits is 47239200, while the sum is 63.

The spelling of 91539569664 in words is "ninety-one billion, five hundred thirty-nine million, five hundred sixty-nine thousand, six hundred sixty-four".