257996699777 has 2 divisors, whose sum is σ = 257996699778. Its totient is φ = 257996699776.

The previous prime is 257996699773. The next prime is 257996699809. The reversal of 257996699777 is 777996699752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242567085121 + 15429614656 = 492511^2 + 124216^2 .

It is a cyclic number.

It is not a de Polignac number, because 257996699777 - 2² = 257996699773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257996699695 and 257996699704.

It is not a weakly prime, because it can be changed into another prime (257996699773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128998349888 + 128998349889.

It is an arithmetic number, because the mean of its divisors is an integer number (128998349889).

Almost surely, 2^257996699777 is an apocalyptic number.

It is an amenable number.

257996699777 is a deficient number, since it is larger than the sum of its proper divisors (1).

257996699777 is an equidigital number, since it uses as much as digits as its factorization.

257996699777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5671065960, while the sum is 83.

The spelling of 257996699777 in words is "two hundred fifty-seven billion, nine hundred ninety-six million, six hundred ninety-nine thousand, seven hundred seventy-seven".