111616156665 has 24 divisors (see below), whose sum is σ = 208350160200. Its totient is φ = 54949492224.

The previous prime is 111616156651. The next prime is 111616156703. The reversal of 111616156665 is 566651616111.

It can be written as a sum of positive squares in 4 ways, for example, as 8052549696 + 103563606969 = 89736^2 + 321813^2 .

It is not a de Polignac number, because 111616156665 - 2⁴ = 111616156649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111616156665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95397840 + ... + 95399009.

It is an arithmetic number, because the mean of its divisors is an integer number (8681256675).

Almost surely, 2^111616156665 is an apocalyptic number.

111616156665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111616156665 is a deficient number, since it is larger than the sum of its proper divisors (96734003535).

111616156665 is a wasteful number, since it uses less digits than its factorization.

111616156665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190796873 (or 190796870 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The spelling of 111616156665 in words is "one hundred eleven billion, six hundred sixteen million, one hundred fifty-six thousand, six hundred sixty-five".