11660666655 has 64 divisors (see below), whose sum is σ = 20530298880. Its totient is φ = 5604700800.

The previous prime is 11660666593. The next prime is 11660666663. The reversal of 11660666655 is 55666606611.

It is not a de Polignac number, because 11660666655 - 2¹⁰ = 11660665631 is a prime.

It is a super-2 number, since 2×11660666655² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11442736 + ... + 11443754.

It is an arithmetic number, because the mean of its divisors is an integer number (320785920).

Almost surely, 2^11660666655 is an apocalyptic number.

11660666655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11660666655 is a deficient number, since it is larger than the sum of its proper divisors (8869632225).

11660666655 is a wasteful number, since it uses less digits than its factorization.

11660666655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 11660666655 in words is "eleven billion, six hundred sixty million, six hundred sixty-six thousand, six hundred fifty-five".