2565474817 has 2 divisors, whose sum is σ = 2565474818. Its totient is φ = 2565474816.

The previous prime is 2565474761. The next prime is 2565474833. The reversal of 2565474817 is 7184745652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2495601936 + 69872881 = 49956^2 + 8359^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565474817 - 2²³ = 2557086209 is a prime.

It is a super-2 number, since 2×2565474817² = 13163322073322366978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2565474617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282737408 + 1282737409.

It is an arithmetic number, because the mean of its divisors is an integer number (1282737409).

Almost surely, 2^2565474817 is an apocalyptic number.

It is an amenable number.

2565474817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565474817 is an equidigital number, since it uses as much as digits as its factorization.

2565474817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881600, while the sum is 49.

The square root of 2565474817 is about 50650.5164534381. The cubic root of 2565474817 is about 1368.9552510476.

The spelling of 2565474817 in words is "two billion, five hundred sixty-five million, four hundred seventy-four thousand, eight hundred seventeen".