666600600637 has 4 divisors (see below), whose sum is σ = 666607094496. Its totient is φ = 666594106780.

The previous prime is 666600600583. The next prime is 666600600671. The reversal of 666600600637 is 736006006666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666600600637 - 2⁷ = 666600600509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666600630637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090439 + ... + 3299092.

It is an arithmetic number, because the mean of its divisors is an integer number (166651773624).

Almost surely, 2^666600600637 is an apocalyptic number.

It is an amenable number.

666600600637 is a deficient number, since it is larger than the sum of its proper divisors (6493859).

666600600637 is a wasteful number, since it uses less digits than its factorization.

666600600637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493858.

The product of its (nonzero) digits is 979776, while the sum is 46.

The spelling of 666600600637 in words is "six hundred sixty-six billion, six hundred million, six hundred thousand, six hundred thirty-seven".