111165660565 has 4 divisors (see below), whose sum is σ = 133398792684. Its totient is φ = 88932528448.

The previous prime is 111165660563. The next prime is 111165660623. The reversal of 111165660565 is 565066561111.

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 61878552516 + 49287108049 = 248754^2 + 222007^2 .

It is a cyclic number.

It is not a de Polignac number, because 111165660565 - 2¹ = 111165660563 is a prime.

It is a super-2 number, since 2×111165660565² (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 (111165660563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11116566052 + ... + 11116566061.

It is an arithmetic number, because the mean of its divisors is an integer number (33349698171).

Almost surely, 2^111165660565 is an apocalyptic number.

It is an amenable number.

111165660565 is a deficient number, since it is larger than the sum of its proper divisors (22233132119).

111165660565 is an equidigital number, since it uses as much as digits as its factorization.

111165660565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22233132118.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 111165660565 in words is "one hundred eleven billion, one hundred sixty-five million, six hundred sixty thousand, five hundred sixty-five".