91623661572 has 12 divisors (see below), whose sum is σ = 213788543696. Its totient is φ = 30541220520.

The previous prime is 91623661553. The next prime is 91623661589. The reversal of 91623661572 is 27516632619.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×91623661572² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3817652554 + ... + 3817652577.

Almost surely, 2^91623661572 is an apocalyptic number.

It is an amenable number.

91623661572 is an abundant number, since it is smaller than the sum of its proper divisors (122164882124).

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

91623661572 is a wasteful number, since it uses less digits than its factorization.

91623661572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7635305138 (or 7635305136 counting only the distinct ones).

The product of its digits is 816480, while the sum is 48.

The spelling of 91623661572 in words is "ninety-one billion, six hundred twenty-three million, six hundred sixty-one thousand, five hundred seventy-two".