2565340457 has 4 divisors (see below), whose sum is σ = 2565729540. Its totient is φ = 2564951376.

The previous prime is 2565340441. The next prime is 2565340513. The reversal of 2565340457 is 7540435652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1971004816 + 594335641 = 44396^2 + 24379^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565340457 - 2⁴ = 2565340441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565342457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184478 + ... + 197895.

It is an arithmetic number, because the mean of its divisors is an integer number (641432385).

Almost surely, 2^2565340457 is an apocalyptic number.

It is an amenable number.

2565340457 is a deficient number, since it is larger than the sum of its proper divisors (389083).

2565340457 is an equidigital number, since it uses as much as digits as its factorization.

2565340457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389082.

The product of its (nonzero) digits is 504000, while the sum is 41.

The square root of 2565340457 is about 50649.1900922414. The cubic root of 2565340457 is about 1368.9313521528.

The spelling of 2565340457 in words is "two billion, five hundred sixty-five million, three hundred forty thousand, four hundred fifty-seven".