2565335521 has 32 divisors (see below), whose sum is σ = 3281264640. Its totient is φ = 1954839744.

The previous prime is 2565335501. The next prime is 2565335543. The reversal of 2565335521 is 1255335652.

It is a cyclic number.

It is not a de Polignac number, because 2565335521 - 2²³ = 2556946913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2565335501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154216 + ... + 170038.

It is an arithmetic number, because the mean of its divisors is an integer number (102539520).

Almost surely, 2^2565335521 is an apocalyptic number.

It is an amenable number.

2565335521 is a deficient number, since it is larger than the sum of its proper divisors (715929119).

2565335521 is a wasteful number, since it uses less digits than its factorization.

2565335521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15925.

The product of its digits is 135000, while the sum is 37.

The square root of 2565335521 is about 50649.1413648840. The cubic root of 2565335521 is about 1368.9304741602.

The spelling of 2565335521 in words is "two billion, five hundred sixty-five million, three hundred thirty-five thousand, five hundred twenty-one".