666523781304 has 48 divisors (see below), whose sum is σ = 1758625789320. Its totient is φ = 210481191360.

The previous prime is 666523781299. The next prime is 666523781321. The reversal of 666523781304 is 403187325666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38456467 + ... + 38473794.

Almost surely, 2^666523781304 is an apocalyptic number.

It is an amenable number.

666523781304 is an abundant number, since it is smaller than the sum of its proper divisors (1092102008016).

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

666523781304 is a wasteful number, since it uses less digits than its factorization.

666523781304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76930308 (or 76930285 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 666523781304 in words is "six hundred sixty-six billion, five hundred twenty-three million, seven hundred eighty-one thousand, three hundred four".