666399792 has 40 divisors (see below), whose sum is σ = 1796385024. Its totient is φ = 212474944.

The previous prime is 666399791. The next prime is 666399809. The reversal of 666399792 is 297993666.

It is not an unprimeable number, because it can be changed into a prime (666399791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300708 + ... + 302915.

Almost surely, 2^666399792 is an apocalyptic number.

It is an amenable number.

666399792 is an abundant number, since it is smaller than the sum of its proper divisors (1129985232).

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

666399792 is a wasteful number, since it uses less digits than its factorization.

666399792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603657 (or 603651 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 57.

The square root of 666399792 is about 25814.7204517113. The cubic root of 666399792 is about 873.4638809306.

The spelling of 666399792 in words is "six hundred sixty-six million, three hundred ninety-nine thousand, seven hundred ninety-two".