2564600257 has 4 divisors (see below), whose sum is σ = 2676104640. Its totient is φ = 2453095876.

The previous prime is 2564600251. The next prime is 2564600273. The reversal of 2564600257 is 7520064652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564600257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564600251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55752157 + ... + 55752202.

It is an arithmetic number, because the mean of its divisors is an integer number (669026160).

Almost surely, 2^2564600257 is an apocalyptic number.

It is an amenable number.

2564600257 is a deficient number, since it is larger than the sum of its proper divisors (111504383).

2564600257 is a wasteful number, since it uses less digits than its factorization.

2564600257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111504382.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 2564600257 is about 50641.8824393407. The cubic root of 2564600257 is about 1368.7996762633.

The spelling of 2564600257 in words is "two billion, five hundred sixty-four million, six hundred thousand, two hundred fifty-seven".