11666556505568 has 24 divisors (see below), whose sum is σ = 23031117702432. Its totient is φ = 5817383755776.

The previous prime is 11666556505517. The next prime is 11666556505603. The reversal of 11666556505568 is 86550565566611.

11666556505568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11666556505568² (a number of 27 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 3 ways as a sum of consecutive naturals, for example, 496691105 + ... + 496714592.

It is an arithmetic number, because the mean of its divisors is an integer number (959629904268).

Almost surely, 2^{11666556505568} is an apocalyptic number.

It is an amenable number.

11666556505568 is a deficient number, since it is larger than the sum of its proper divisors (11364561196864).

11666556505568 is an equidigital number, since it uses as much as digits as its factorization.

11666556505568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993406074 (or 993406066 counting only the distinct ones).

The product of its (nonzero) digits is 194400000, while the sum is 65.

The spelling of 11666556505568 in words is "eleven trillion, six hundred sixty-six billion, five hundred fifty-six million, five hundred five thousand, five hundred sixty-eight".