561645604 has 12 divisors (see below), whose sum is σ = 1058486044. Its totient is φ = 259221024.

The previous prime is 561645587. The next prime is 561645613. The reversal of 561645604 is 406546165.

It can be written as a sum of positive squares in 2 ways, for example, as 167702500 + 393943104 = 12950^2 + 19848^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5400387 + ... + 5400490.

Almost surely, 2^561645604 is an apocalyptic number.

It is an amenable number.

561645604 is a deficient number, since it is larger than the sum of its proper divisors (496840440).

561645604 is a wasteful number, since it uses less digits than its factorization.

561645604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800894 (or 10800892 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 561645604 is about 23699.0633570190. The cubic root of 561645604 is about 825.0636517770.

The spelling of 561645604 in words is "five hundred sixty-one million, six hundred forty-five thousand, six hundred four".