52565561521 has 8 divisors (see below), whose sum is σ = 57345909984. Its totient is φ = 47785489920.

The previous prime is 52565561513. The next prime is 52565561567. The reversal of 52565561521 is 12516556525.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52565561521 - 2³ = 52565561513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52565561821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687985 + ... + 760561.

It is an arithmetic number, because the mean of its divisors is an integer number (7168238748).

Almost surely, 2^52565561521 is an apocalyptic number.

It is an amenable number.

52565561521 is a deficient number, since it is larger than the sum of its proper divisors (4780348463).

52565561521 is a wasteful number, since it uses less digits than its factorization.

52565561521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138431.

The product of its digits is 450000, while the sum is 43.

The spelling of 52565561521 in words is "fifty-two billion, five hundred sixty-five million, five hundred sixty-one thousand, five hundred twenty-one".