667400080128 has 72 divisors (see below), whose sum is σ = 1817565908928. Its totient is φ = 217293038592.

The previous prime is 667400080069. The next prime is 667400080157. The reversal of 667400080128 is 821080004766.

It is a self number, because there is not a number n which added to its sum of digits gives 667400080128.

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, 10071750 + ... + 10137797.

Almost surely, 2^667400080128 is an apocalyptic number.

It is an amenable number.

667400080128 is an abundant number, since it is smaller than the sum of its proper divisors (1150165828800).

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

667400080128 is a wasteful number, since it uses less digits than its factorization.

667400080128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20209609 (or 20209595 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 667400080128 in words is "six hundred sixty-seven billion, four hundred million, eighty thousand, one hundred twenty-eight".