561665264 has 20 divisors (see below), whose sum is σ = 1088762904. Its totient is φ = 280694208.

The previous prime is 561665231. The next prime is 561665281. The reversal of 561665264 is 462566165.

It is a congruent number.

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, 30074 + ... + 45030.

Almost surely, 2^561665264 is an apocalyptic number.

It is an amenable number.

561665264 is a deficient number, since it is larger than the sum of its proper divisors (527097640).

561665264 is a wasteful number, since it uses less digits than its factorization.

561665264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17312 (or 17306 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The square root of 561665264 is about 23699.4781377143. The cubic root of 561665264 is about 825.0732785844.

Subtracting from 561665264 its reverse (462566165), we obtain a palindrome (99099099).

The spelling of 561665264 in words is "five hundred sixty-one million, six hundred sixty-five thousand, two hundred sixty-four".