257659956823 has 2 divisors, whose sum is σ = 257659956824. Its totient is φ = 257659956822.

The previous prime is 257659956773. The next prime is 257659956863. The reversal of 257659956823 is 328659956752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257659956823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257659956863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128829978411 + 128829978412.

It is an arithmetic number, because the mean of its divisors is an integer number (128829978412).

Almost surely, 2^257659956823 is an apocalyptic number.

257659956823 is a deficient number, since it is larger than the sum of its proper divisors (1).

257659956823 is an equidigital number, since it uses as much as digits as its factorization.

257659956823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944000, while the sum is 67.

The spelling of 257659956823 in words is "two hundred fifty-seven billion, six hundred fifty-nine million, nine hundred fifty-six thousand, eight hundred twenty-three".