666700406667 has 6 divisors (see below), whose sum is σ = 963011698532. Its totient is φ = 444466937772.

The previous prime is 666700406657. The next prime is 666700406681. The reversal of 666700406667 is 766604007666.

It is not a de Polignac number, because 666700406667 - 2⁴ = 666700406651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666700406657) 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 5 ways as a sum of consecutive naturals, for example, 37038911473 + ... + 37038911490.

Almost surely, 2^666700406667 is an apocalyptic number.

666700406667 is a deficient number, since it is larger than the sum of its proper divisors (296311291865).

666700406667 is a wasteful number, since it uses less digits than its factorization.

666700406667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74077822969 (or 74077822966 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 666700406667 in words is "six hundred sixty-six billion, seven hundred million, four hundred six thousand, six hundred sixty-seven".