666879960 has 32 divisors (see below), whose sum is σ = 2000640240. Its totient is φ = 177834624.

The previous prime is 666879959. The next prime is 666880007. The reversal of 666879960 is 69978666.

It is a self number, because there is not a number n which added to its sum of digits gives 666879960.

It is a congruent number.

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, 2778547 + ... + 2778786.

Almost surely, 2^666879960 is an apocalyptic number.

666879960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666879960 is an abundant number, since it is smaller than the sum of its proper divisors (1333760280).

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

666879960 is a wasteful number, since it uses less digits than its factorization.

666879960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557347 (or 5557343 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 57.

The square root of 666879960 is about 25824.0190520376. The cubic root of 666879960 is about 873.6736192470.

The spelling of 666879960 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, nine hundred sixty".