561520545725 has 12 divisors (see below), whose sum is σ = 696316826100. Its totient is φ = 449196211200.

The previous prime is 561520545623. The next prime is 561520545767. The reversal of 561520545725 is 527545025165.

It can be written as a sum of positive squares in 6 ways, for example, as 12103080196 + 549417465529 = 110014^2 + 741227^2 .

It is not a de Polignac number, because 561520545725 - 2¹⁸ = 561520283581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561520545725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73751 + ... + 1062299.

It is an arithmetic number, because the mean of its divisors is an integer number (58026402175).

Almost surely, 2^561520545725 is an apocalyptic number.

It is an amenable number.

561520545725 is a deficient number, since it is larger than the sum of its proper divisors (134796280375).

561520545725 is a wasteful number, since it uses less digits than its factorization.

561520545725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011280 (or 1011275 counting only the distinct ones).

The product of its (nonzero) digits is 2100000, while the sum is 47.

The spelling of 561520545725 in words is "five hundred sixty-one billion, five hundred twenty million, five hundred forty-five thousand, seven hundred twenty-five".