11660666656 has 24 divisors (see below), whose sum is σ = 24307346700. Its totient is φ = 5487372288.

The previous prime is 11660666593. The next prime is 11660666663. The reversal of 11660666656 is 65666606611.

It can be written as a sum of positive squares in 2 ways, for example, as 11042647056 + 618019600 = 105084^2 + 24860^2 .

It is a super-2 number, since 2×11660666656² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10716981 + ... + 10718068.

Almost surely, 2^11660666656 is an apocalyptic number.

11660666656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11660666656 is an abundant number, since it is smaller than the sum of its proper divisors (12646680044).

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

11660666656 is a wasteful number, since it uses less digits than its factorization.

11660666656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21435076 (or 21435068 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 11660666656 in words is "eleven billion, six hundred sixty million, six hundred sixty-six thousand, six hundred fifty-six".