666037730666 has 64 divisors (see below), whose sum is σ = 1295573114880. Its totient is φ = 249207192000.

The previous prime is 666037730641. The next prime is 666037730707.

666037730666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92900 + ... + 1157888.

It is an arithmetic number, because the mean of its divisors is an integer number (20243329920).

Almost surely, 2^666037730666 is an apocalyptic number.

666037730666 is a deficient number, since it is larger than the sum of its proper divisors (629535384214).

666037730666 is a wasteful number, since it uses less digits than its factorization.

666037730666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065171.

The product of its (nonzero) digits is 20575296, while the sum is 56.

The spelling of 666037730666 in words is "six hundred sixty-six billion, thirty-seven million, seven hundred thirty thousand, six hundred sixty-six".