11660640656 has 20 divisors (see below), whose sum is σ = 25819990272. Its totient is φ = 4997417376.

The previous prime is 11660640569. The next prime is 11660640661. The reversal of 11660640656 is 65604606611.

It is a super-2 number, since 2×11660640656² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 52056320 + ... + 52056543.

Almost surely, 2^11660640656 is an apocalyptic number.

11660640656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11660640656 is an abundant number, since it is smaller than the sum of its proper divisors (14159349616).

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

11660640656 is a wasteful number, since it uses less digits than its factorization.

11660640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104112878 (or 104112872 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 11660640656 in words is "eleven billion, six hundred sixty million, six hundred forty thousand, six hundred fifty-six".