257705751117 has 4 divisors (see below), whose sum is σ = 343607668160. Its totient is φ = 171803834076.

The previous prime is 257705751113. The next prime is 257705751131. The reversal of 257705751117 is 711157507752.

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 not a de Polignac number, because 257705751117 - 2² = 257705751113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257705751113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42950958517 + ... + 42950958522.

It is an arithmetic number, because the mean of its divisors is an integer number (85901917040).

Almost surely, 2^257705751117 is an apocalyptic number.

It is an amenable number.

257705751117 is a deficient number, since it is larger than the sum of its proper divisors (85901917043).

257705751117 is an equidigital number, since it uses as much as digits as its factorization.

257705751117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85901917042.

The product of its (nonzero) digits is 600250, while the sum is 48.

The spelling of 257705751117 in words is "two hundred fifty-seven billion, seven hundred five million, seven hundred fifty-one thousand, one hundred seventeen".