2564521497 has 6 divisors (see below), whose sum is σ = 3704308842. Its totient is φ = 1709680992.

The previous prime is 2564521483. The next prime is 2564521507. The reversal of 2564521497 is 7941254652.

2564521497 is a `hidden beast` number, since 2 + 56 + 452 + 149 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1667578896 + 896942601 = 40836^2 + 29949^2 .

It is not a de Polignac number, because 2564521497 - 2⁴ = 2564521481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2564521697) 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, 142473408 + ... + 142473425.

It is an arithmetic number, because the mean of its divisors is an integer number (617384807).

Almost surely, 2^2564521497 is an apocalyptic number.

It is an amenable number.

2564521497 is a deficient number, since it is larger than the sum of its proper divisors (1139787345).

2564521497 is a wasteful number, since it uses less digits than its factorization.

2564521497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284946839 (or 284946836 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 2564521497 is about 50641.1048161471. The cubic root of 2564521497 is about 1368.7856639735.

The spelling of 2564521497 in words is "two billion, five hundred sixty-four million, five hundred twenty-one thousand, four hundred ninety-seven".