91555523209912 has 16 divisors (see below), whose sum is σ = 175658852670840. Its totient is φ = 44713162497696.

The previous prime is 91555523209907. The next prime is 91555523209919. The reversal of 91555523209912 is 21990232555519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91555523209919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133074888043 + ... + 133074888730.

Almost surely, 2^{91555523209912} is an apocalyptic number.

It is an amenable number.

91555523209912 is a deficient number, since it is larger than the sum of its proper divisors (84103329460928).

91555523209912 is a wasteful number, since it uses less digits than its factorization.

91555523209912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266149776822 (or 266149776818 counting only the distinct ones).

The product of its (nonzero) digits is 10935000, while the sum is 58.

The spelling of 91555523209912 in words is "ninety-one trillion, five hundred fifty-five billion, five hundred twenty-three million, two hundred nine thousand, nine hundred twelve".