25700000257 has 8 divisors (see below), whose sum is σ = 27317651976. Its totient is φ = 24094113792.

The previous prime is 25700000243. The next prime is 25700000279. The reversal of 25700000257 is 75200000752.

It can be written as a sum of positive squares in 4 ways, for example, as 18626517441 + 7073482816 = 136479^2 + 84104^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25700000257 - 2³¹ = 23552516609 is a prime.

It is a deceptive number, since it divides R_25700000256.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25700000057) 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 7 ways as a sum of consecutive naturals, for example, 2936808 + ... + 2945545.

It is an arithmetic number, because the mean of its divisors is an integer number (3414706497).

Almost surely, 2^25700000257 is an apocalyptic number.

It is an amenable number.

25700000257 is a deficient number, since it is larger than the sum of its proper divisors (1617651719).

25700000257 is a wasteful number, since it uses less digits than its factorization.

25700000257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882627.

The product of its (nonzero) digits is 4900, while the sum is 28.

The spelling of 25700000257 in words is "twenty-five billion, seven hundred million, two hundred fifty-seven", and thus it is an aban number.