257838632129 has 4 divisors (see below), whose sum is σ = 277672373076. Its totient is φ = 238004891184.

The previous prime is 257838632119. The next prime is 257838632167. The reversal of 257838632129 is 921236838752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148396759729 + 109441872400 = 385223^2 + 330820^2 .

It is a cyclic number.

It is not a de Polignac number, because 257838632129 - 2⁸ = 257838631873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257838632119) 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, 9916870454 + ... + 9916870479.

It is an arithmetic number, because the mean of its divisors is an integer number (69418093269).

Almost surely, 2^257838632129 is an apocalyptic number.

It is an amenable number.

257838632129 is a deficient number, since it is larger than the sum of its proper divisors (19833740947).

257838632129 is a wasteful number, since it uses less digits than its factorization.

257838632129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19833740946.

The product of its digits is 8709120, while the sum is 56.

The spelling of 257838632129 in words is "two hundred fifty-seven billion, eight hundred thirty-eight million, six hundred thirty-two thousand, one hundred twenty-nine".