111665628599 has 16 divisors (see below), whose sum is σ = 127899096576. Its totient is φ = 95502607200.

The previous prime is 111665628587. The next prime is 111665628629. The reversal of 111665628599 is 995826566111.

It is a happy number.

It is not a de Polignac number, because 111665628599 - 2³⁶ = 42946151863 is a prime.

It is a super-2 number, since 2×111665628599² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111665628509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17690654 + ... + 17696964.

It is an arithmetic number, because the mean of its divisors is an integer number (7993693536).

Almost surely, 2^111665628599 is an apocalyptic number.

111665628599 is a deficient number, since it is larger than the sum of its proper divisors (16233467977).

111665628599 is an equidigital number, since it uses as much as digits as its factorization.

111665628599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486.

The product of its digits is 6998400, while the sum is 59.

The spelling of 111665628599 in words is "one hundred eleven billion, six hundred sixty-five million, six hundred twenty-eight thousand, five hundred ninety-nine".