561165552265 has 16 divisors (see below), whose sum is σ = 698374086480. Its totient is φ = 432360149760.

The previous prime is 561165552257. The next prime is 561165552281. The reversal of 561165552265 is 562255561165.

It can be written as a sum of positive squares in 8 ways, for example, as 31583332089 + 529582220176 = 177717^2 + 727724^2 .

It is not a de Polignac number, because 561165552265 - 2³ = 561165552257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4816626 + ... + 4931755.

It is an arithmetic number, because the mean of its divisors is an integer number (43648380405).

Almost surely, 2^561165552265 is an apocalyptic number.

It is an amenable number.

561165552265 is a deficient number, since it is larger than the sum of its proper divisors (137208534215).

561165552265 is a wasteful number, since it uses less digits than its factorization.

561165552265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748812.

The product of its digits is 2700000, while the sum is 49.

The spelling of 561165552265 in words is "five hundred sixty-one billion, one hundred sixty-five million, five hundred fifty-two thousand, two hundred sixty-five".