666880688 has 10 divisors (see below), whose sum is σ = 1292081364. Its totient is φ = 333440336.

The previous prime is 666880673. The next prime is 666880733. The reversal of 666880688 is 886088666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20840006 + ... + 20840037.

Almost surely, 2^666880688 is an apocalyptic number.

It is an amenable number.

666880688 is a deficient number, since it is larger than the sum of its proper divisors (625200676).

666880688 is a wasteful number, since it uses less digits than its factorization.

666880688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41680051 (or 41680045 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 56.

The square root of 666880688 is about 25824.0331474385. The cubic root of 666880688 is about 873.6739371624.

The spelling of 666880688 in words is "six hundred sixty-six million, eight hundred eighty thousand, six hundred eighty-eight".