11666515655564 has 36 divisors (see below), whose sum is σ = 25908755551560. Its totient is φ = 4545395709120.

The previous prime is 11666515655527. The next prime is 11666515655567. The reversal of 11666515655564 is 46555651566611.

It is a super-2 number, since 2×11666515655564² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11666515655497 and 11666515655506.

It is not an unprimeable number, because it can be changed into a prime (11666515655567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2705590529 + ... + 2705594840.

It is an arithmetic number, because the mean of its divisors is an integer number (719687654210).

Almost surely, 2^{11666515655564} is an apocalyptic number.

11666515655564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

11666515655564 is an abundant number, since it is smaller than the sum of its proper divisors (14242239895996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11666515655564 is a wasteful number, since it uses less digits than its factorization.

11666515655564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5411185398 (or 5411185389 counting only the distinct ones).

The product of its digits is 97200000, while the sum is 62.

The spelling of 11666515655564 in words is "eleven trillion, six hundred sixty-six billion, five hundred fifteen million, six hundred fifty-five thousand, five hundred sixty-four".