255121706257 has 4 divisors (see below), whose sum is σ = 278314588656. Its totient is φ = 231928823860.

The previous prime is 255121706249. The next prime is 255121706261. The reversal of 255121706257 is 752607121552.

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 not a de Polignac number, because 255121706257 - 2³ = 255121706249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255121706227) 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, 11596441183 + ... + 11596441204.

It is an arithmetic number, because the mean of its divisors is an integer number (69578647164).

Almost surely, 2^255121706257 is an apocalyptic number.

It is an amenable number.

255121706257 is a deficient number, since it is larger than the sum of its proper divisors (23192882399).

255121706257 is a wasteful number, since it uses less digits than its factorization.

255121706257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23192882398.

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 255121706257 in words is "two hundred fifty-five billion, one hundred twenty-one million, seven hundred six thousand, two hundred fifty-seven".