666997476 has 24 divisors (see below), whose sum is σ = 1558751040. Its totient is φ = 221986272.

The previous prime is 666997459. The next prime is 666997517. The reversal of 666997476 is 674799666.

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, 35191 + ... + 50718.

It is an arithmetic number, because the mean of its divisors is an integer number (64947960).

Almost surely, 2^666997476 is an apocalyptic number.

It is an amenable number.

666997476 is an abundant number, since it is smaller than the sum of its proper divisors (891753564).

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

666997476 is a wasteful number, since it uses less digits than its factorization.

666997476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86563 (or 86561 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 60.

The square root of 666997476 is about 25826.2942754085. The cubic root of 666997476 is about 873.7249351284.

The spelling of 666997476 in words is "six hundred sixty-six million, nine hundred ninety-seven thousand, four hundred seventy-six".