257530025705 has 8 divisors (see below), whose sum is σ = 317388356232. Its totient is φ = 200455803648.

The previous prime is 257530025681. The next prime is 257530025707. The reversal of 257530025705 is 507520035752.

It can be written as a sum of positive squares in 4 ways, for example, as 100151995024 + 157378030681 = 316468^2 + 396709^2 .

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 257530025705 - 2⁸ = 257530025449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257530025707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696026912 + ... + 696027281.

It is an arithmetic number, because the mean of its divisors is an integer number (39673544529).

Almost surely, 2^257530025705 is an apocalyptic number.

It is an amenable number.

257530025705 is a deficient number, since it is larger than the sum of its proper divisors (59858330527).

257530025705 is a wasteful number, since it uses less digits than its factorization.

257530025705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392054235.

The product of its (nonzero) digits is 367500, while the sum is 41.

The spelling of 257530025705 in words is "two hundred fifty-seven billion, five hundred thirty million, twenty-five thousand, seven hundred five".