667873556 has 12 divisors (see below), whose sum is σ = 1335747168. Its totient is φ = 286231512.

The previous prime is 667873519. The next prime is 667873571. The reversal of 667873556 is 655378766.

It is a happy number.

667873556 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 667873498 and 667873507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11926286 + ... + 11926341.

It is an arithmetic number, because the mean of its divisors is an integer number (111312264).

Almost surely, 2^667873556 is an apocalyptic number.

It is an amenable number.

667873556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

667873556 is a wasteful number, since it uses less digits than its factorization.

667873556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23852638 (or 23852636 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 53.

The square root of 667873556 is about 25843.2497182533. The cubic root of 667873556 is about 874.1073044178.

The spelling of 667873556 in words is "six hundred sixty-seven million, eight hundred seventy-three thousand, five hundred fifty-six".