11666556651 has 8 divisors (see below), whose sum is σ = 15565496320. Its totient is φ = 7772660712.

The previous prime is 11666556619. The next prime is 11666556659. The reversal of 11666556651 is 15665566611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11666556651 - 2⁵ = 11666556619 is a prime.

It is a super-2 number, since 2×11666556651² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11666556651.

It is not an unprimeable number, because it can be changed into a prime (11666556659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1255531 + ... + 1264788.

It is an arithmetic number, because the mean of its divisors is an integer number (1945687040).

Almost surely, 2^11666556651 is an apocalyptic number.

11666556651 is a deficient number, since it is larger than the sum of its proper divisors (3898939669).

11666556651 is a wasteful number, since it uses less digits than its factorization.

11666556651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521865.

The product of its digits is 972000, while the sum is 48.

The spelling of 11666556651 in words is "eleven billion, six hundred sixty-six million, five hundred fifty-six thousand, six hundred fifty-one".