666037630658 has 4 divisors (see below), whose sum is σ = 999056445990. Its totient is φ = 333018815328.

The previous prime is 666037630649. The next prime is 666037630723. The reversal of 666037630658 is 856036730666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 661468276249 + 4569354409 = 813307^2 + 67597^2 .

It is a super-2 number, since 2×666037630658² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166509407663 + ... + 166509407666.

Almost surely, 2^666037630658 is an apocalyptic number.

666037630658 is a deficient number, since it is larger than the sum of its proper divisors (333018815332).

666037630658 is a wasteful number, since it uses less digits than its factorization.

666037630658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333018815331.

The product of its (nonzero) digits is 19595520, while the sum is 56.

The spelling of 666037630658 in words is "six hundred sixty-six billion, thirty-seven million, six hundred thirty thousand, six hundred fifty-eight".