52564973661 has 6 divisors (see below), whose sum is σ = 75927184190. Its totient is φ = 35043315768.

The previous prime is 52564973647. The next prime is 52564973687. The reversal of 52564973661 is 16637946525.

52564973661 is a `hidden beast` number, since 5 + 2 + 564 + 9 + 73 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45084453561 + 7480520100 = 212331^2 + 86490^2 .

It is not a de Polignac number, because 52564973661 - 2⁷ = 52564973533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 52564973598 and 52564973607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52564973161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2920276306 + ... + 2920276323.

Almost surely, 2^52564973661 is an apocalyptic number.

It is an amenable number.

52564973661 is a deficient number, since it is larger than the sum of its proper divisors (23362210529).

52564973661 is a wasteful number, since it uses less digits than its factorization.

52564973661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840552635 (or 5840552632 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 52564973661 in words is "fifty-two billion, five hundred sixty-four million, nine hundred seventy-three thousand, six hundred sixty-one".