666667407408 has 40 divisors (see below), whose sum is σ = 1722969651456. Its totient is φ = 222126273600.

The previous prime is 666667407389. The next prime is 666667407421. The reversal of 666667407408 is 804704766666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2894028 + ... + 3115883.

Almost surely, 2^666667407408 is an apocalyptic number.

It is an amenable number.

666667407408 is an abundant number, since it is smaller than the sum of its proper divisors (1056302244048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666667407408 is a wasteful number, since it uses less digits than its factorization.

666667407408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6012233 (or 6012227 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 60.

The spelling of 666667407408 in words is "six hundred sixty-six billion, six hundred sixty-seven million, four hundred seven thousand, four hundred eight".