11657536665 has 32 divisors (see below), whose sum is σ = 19159220736. Its totient is φ = 6049831680.

The previous prime is 11657536643. The next prime is 11657536669. The reversal of 11657536665 is 56663575611.

It is not a de Polignac number, because 11657536665 - 2⁷ = 11657536537 is a prime.

It is a super-2 number, since 2×11657536665² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11657536669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74175 + ... + 169755.

It is an arithmetic number, because the mean of its divisors is an integer number (598725648).

Almost surely, 2^11657536665 is an apocalyptic number.

11657536665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11657536665 is a deficient number, since it is larger than the sum of its proper divisors (7501684071).

11657536665 is a wasteful number, since it uses less digits than its factorization.

11657536665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95809.

The product of its digits is 3402000, while the sum is 51.

The spelling of 11657536665 in words is "eleven billion, six hundred fifty-seven million, five hundred thirty-six thousand, six hundred sixty-five".