111111099972 has 24 divisors (see below), whose sum is σ = 259303586976. Its totient is φ = 37030697088.

The previous prime is 111111099971. The next prime is 111111099991. The reversal of 111111099972 is 279990111111.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (111111099971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718693 + ... + 859500.

It is an arithmetic number, because the mean of its divisors is an integer number (10804316124).

Almost surely, 2^111111099972 is an apocalyptic number.

111111099972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111111099972 is an abundant number, since it is smaller than the sum of its proper divisors (148192487004).

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

111111099972 is a wasteful number, since it uses less digits than its factorization.

111111099972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584067 (or 1584065 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 42.

The spelling of 111111099972 in words is "one hundred eleven billion, one hundred eleven million, ninety-nine thousand, nine hundred seventy-two".