111158991972 has 72 divisors (see below), whose sum is σ = 321479139072. Its totient is φ = 31724784000.

The previous prime is 111158991971. The next prime is 111158992001. The reversal of 111158991972 is 279199851111.

It is not an unprimeable number, because it can be changed into a prime (111158991971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12529 + ... + 471672.

Almost surely, 2^111158991972 is an apocalyptic number.

111158991972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111158991972 is an abundant number, since it is smaller than the sum of its proper divisors (210320147100).

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

111158991972 is a wasteful number, since it uses less digits than its factorization.

111158991972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485129 (or 485124 counting only the distinct ones).

The product of its digits is 408240, while the sum is 54.

The spelling of 111158991972 in words is "one hundred eleven billion, one hundred fifty-eight million, nine hundred ninety-one thousand, nine hundred seventy-two".