11666555564 has 24 divisors (see below), whose sum is σ = 20711124000. Its totient is φ = 5749148160.

The previous prime is 11666555561. The next prime is 11666555591. The reversal of 11666555564 is 46555566611.

It is a happy number.

It is a super-2 number, since 2×11666555564² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666555561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167662 + ... + 1177610.

It is an arithmetic number, because the mean of its divisors is an integer number (862963500).

Almost surely, 2^11666555564 is an apocalyptic number.

It is an amenable number.

11666555564 is a deficient number, since it is larger than the sum of its proper divisors (9044568436).

11666555564 is a wasteful number, since it uses less digits than its factorization.

11666555564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153 (or 14151 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 50.

The spelling of 11666555564 in words is "eleven billion, six hundred sixty-six million, five hundred fifty-five thousand, five hundred sixty-four".