666644264 has 32 divisors (see below), whose sum is σ = 1468484640. Its totient is φ = 279710400.

The previous prime is 666644221. The next prime is 666644269. The reversal of 666644264 is 462446666.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (666644269) 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, 290222 + ... + 292509.

It is an arithmetic number, because the mean of its divisors is an integer number (45890145).

Almost surely, 2^666644264 is an apocalyptic number.

It is an amenable number.

666644264 is an abundant number, since it is smaller than the sum of its proper divisors (801840376).

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

666644264 is a wasteful number, since it uses less digits than its factorization.

666644264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582761 (or 582757 counting only the distinct ones).

The product of its digits is 995328, while the sum is 44.

The square root of 666644264 is about 25819.4551452969. The cubic root of 666644264 is about 873.5706793607.

The spelling of 666644264 in words is "six hundred sixty-six million, six hundred forty-four thousand, two hundred sixty-four".