11551666655631 has 8 divisors (see below), whose sum is σ = 15619154914944. Its totient is φ = 7592644750040.

The previous prime is 11551666655597. The next prime is 11551666655699. The reversal of 11551666655631 is 13655666615511.

It is a happy number.

11551666655631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11551666655631 - 2⁴² = 7153620144527 is a prime.

It is a super-2 number, since 2×11551666655631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551666655531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27116588181 + ... + 27116588606.

It is an arithmetic number, because the mean of its divisors is an integer number (1952394364368).

Almost surely, 2^{11551666655631} is an apocalyptic number.

11551666655631 is a deficient number, since it is larger than the sum of its proper divisors (4067488259313).

11551666655631 is an equidigital number, since it uses as much as digits as its factorization.

11551666655631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54233176861.

The product of its digits is 14580000, while the sum is 57.

The spelling of 11551666655631 in words is "eleven trillion, five hundred fifty-one billion, six hundred sixty-six million, six hundred fifty-five thousand, six hundred thirty-one".