668665476 has 48 divisors (see below), whose sum is σ = 1808956800. Its totient is φ = 213196896.

The previous prime is 668665463. The next prime is 668665507. The reversal of 668665476 is 674566866.

It is a super-2 number, since 2×668665476² = 894227037588613152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132111 + ... + 137078.

It is an arithmetic number, because the mean of its divisors is an integer number (37686600).

Almost surely, 2^668665476 is an apocalyptic number.

It is an amenable number.

668665476 is an abundant number, since it is smaller than the sum of its proper divisors (1140291324).

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

668665476 is a wasteful number, since it uses less digits than its factorization.

668665476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269225 (or 269217 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The square root of 668665476 is about 25858.5667816296. The cubic root of 668665476 is about 874.4526540393.

The spelling of 668665476 in words is "six hundred sixty-eight million, six hundred sixty-five thousand, four hundred seventy-six".