2579725521 has 12 divisors (see below), whose sum is σ = 3726711300. Its totient is φ = 1719613440.

The previous prime is 2579725493. The next prime is 2579725523. The reversal of 2579725521 is 1255279752.

2579725521 is a `hidden beast` number, since 2 + 5 + 7 + 97 + 2 + 552 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2332890000 + 246835521 = 48300^2 + 15711^2 .

It is not a de Polignac number, because 2579725521 - 2²³ = 2571336913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2579725523) 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 11 ways as a sum of consecutive naturals, for example, 133905 + ... + 151953.

It is an arithmetic number, because the mean of its divisors is an integer number (310559275).

Almost surely, 2^2579725521 is an apocalyptic number.

It is an amenable number.

2579725521 is a deficient number, since it is larger than the sum of its proper divisors (1146985779).

2579725521 is a wasteful number, since it uses less digits than its factorization.

2579725521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33936 (or 33933 counting only the distinct ones).

The product of its digits is 441000, while the sum is 45.

The square root of 2579725521 is about 50790.9984249178. The cubic root of 2579725521 is about 1371.4853304587.

The spelling of 2579725521 in words is "two billion, five hundred seventy-nine million, seven hundred twenty-five thousand, five hundred twenty-one".