667880635624 has 8 divisors (see below), whose sum is σ = 1252276191810. Its totient is φ = 333940317808.

The previous prime is 667880635573. The next prime is 667880635637. The reversal of 667880635624 is 426536088766.

It can be written as a sum of positive squares in only one way, i.e., 378778702500 + 289101933124 = 615450^2 + 537682^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41742539719 + ... + 41742539734.

Almost surely, 2^667880635624 is an apocalyptic number.

It is an amenable number.

667880635624 is a deficient number, since it is larger than the sum of its proper divisors (584395556186).

667880635624 is a wasteful number, since it uses less digits than its factorization.

667880635624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83485079459 (or 83485079455 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 61.

The spelling of 667880635624 in words is "six hundred sixty-seven billion, eight hundred eighty million, six hundred thirty-five thousand, six hundred twenty-four".