666656111637 has 12 divisors (see below), whose sum is σ = 962954796960. Its totient is φ = 444434140008.

The previous prime is 666656111617. The next prime is 666656111677. The reversal of 666656111637 is 736111656666.

It is a happy number.

It is not a de Polignac number, because 666656111637 - 2¹⁴ = 666656095253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666656111617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2228914 + ... + 2510252.

It is an arithmetic number, because the mean of its divisors is an integer number (80246233080).

Almost surely, 2^666656111637 is an apocalyptic number.

It is an amenable number.

666656111637 is a deficient number, since it is larger than the sum of its proper divisors (296298685323).

666656111637 is a wasteful number, since it uses less digits than its factorization.

666656111637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544632 (or 544629 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 666656111637 in words is "six hundred sixty-six billion, six hundred fifty-six million, one hundred eleven thousand, six hundred thirty-seven".