111551665105 has 4 divisors (see below), whose sum is σ = 133861998132. Its totient is φ = 89241332080.

The previous prime is 111551664989. The next prime is 111551665133. The reversal of 111551665105 is 501566155111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40345944769 + 71205720336 = 200863^2 + 266844^2 .

It is not a de Polignac number, because 111551665105 - 2⁷ = 111551664977 is a prime.

It is a super-2 number, since 2×111551665105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11155166506 + ... + 11155166515.

It is an arithmetic number, because the mean of its divisors is an integer number (33465499533).

Almost surely, 2^111551665105 is an apocalyptic number.

It is an amenable number.

111551665105 is a deficient number, since it is larger than the sum of its proper divisors (22310333027).

111551665105 is an equidigital number, since it uses as much as digits as its factorization.

111551665105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22310333026.

The product of its (nonzero) digits is 22500, while the sum is 37.

The spelling of 111551665105 in words is "one hundred eleven billion, five hundred fifty-one million, six hundred sixty-five thousand, one hundred five".