666572004 has 120 divisors (see below), whose sum is σ = 2016049728. Its totient is φ = 188101440.

The previous prime is 666571987. The next prime is 666572033. The reversal of 666572004 is 400275666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 666572004.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 186474 + ... + 190014.

Almost surely, 2^666572004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666572004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008024864).

666572004 is an abundant number, since it is smaller than the sum of its proper divisors (1349477724).

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

666572004 is a wasteful number, since it uses less digits than its factorization.

666572004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3647 (or 3636 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 666572004 is about 25818.0557749804. The cubic root of 666572004 is about 873.5391150509.

The spelling of 666572004 in words is "six hundred sixty-six million, five hundred seventy-two thousand, four".