257679954787 has 2 divisors, whose sum is σ = 257679954788. Its totient is φ = 257679954786.

The previous prime is 257679954769. The next prime is 257679954793. The reversal of 257679954787 is 787459976752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257679954787 is a prime.

It is not a weakly prime, because it can be changed into another prime (257679954487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128839977393 + 128839977394.

It is an arithmetic number, because the mean of its divisors is an integer number (128839977394).

Almost surely, 2^257679954787 is an apocalyptic number.

257679954787 is a deficient number, since it is larger than the sum of its proper divisors (1).

257679954787 is an equidigital number, since it uses as much as digits as its factorization.

257679954787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1867017600, while the sum is 76.

The spelling of 257679954787 in words is "two hundred fifty-seven billion, six hundred seventy-nine million, nine hundred fifty-four thousand, seven hundred eighty-seven".