2564576521 has 12 divisors (see below), whose sum is σ = 2897771328. Its totient is φ = 2264371824.

The previous prime is 2564576519. The next prime is 2564576533. The reversal of 2564576521 is 1256754652.

It is not a de Polignac number, because 2564576521 - 2¹ = 2564576519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564576551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326005 + ... + 333778.

It is an arithmetic number, because the mean of its divisors is an integer number (241480944).

Almost surely, 2^2564576521 is an apocalyptic number.

It is an amenable number.

2564576521 is a deficient number, since it is larger than the sum of its proper divisors (333194807).

2564576521 is a wasteful number, since it uses less digits than its factorization.

2564576521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659832 (or 659819 counting only the distinct ones).

The product of its digits is 504000, while the sum is 43.

The square root of 2564576521 is about 50641.6480873204. The cubic root of 2564576521 is about 1368.7954533921.

The spelling of 2564576521 in words is "two billion, five hundred sixty-four million, five hundred seventy-six thousand, five hundred twenty-one".