561877672225 has 27 divisors (see below), whose sum is σ = 701204381611. Its totient is φ = 446632726400.

The previous prime is 561877672199. The next prime is 561877672249. The reversal of 561877672225 is 522276778165.

The square root of 561877672225 is 749585.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 407290305249 + 154587366976 = 638193^2 + 393176^2 .

It is not a de Polignac number, because 561877672225 - 2²⁹ = 561340801313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561877672225.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 738340845 + ... + 738341605.

Almost surely, 2^561877672225 is an apocalyptic number.

561877672225 is the 749585-th square number.

561877672225 is the 374793-rd centered octagonal number.

It is an amenable number.

561877672225 is a deficient number, since it is larger than the sum of its proper divisors (139326709386).

561877672225 is an frugal number, since it uses more digits than its factorization.

561877672225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926 (or 963 counting only the distinct ones).

The product of its digits is 19756800, while the sum is 58.

The spelling of 561877672225 in words is "five hundred sixty-one billion, eight hundred seventy-seven million, six hundred seventy-two thousand, two hundred twenty-five".