257415781087 has 2 divisors, whose sum is σ = 257415781088. Its totient is φ = 257415781086.

The previous prime is 257415781069. The next prime is 257415781093. The reversal of 257415781087 is 780187514752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257415781087 - 2³¹ = 255268297439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257415781067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128707890543 + 128707890544.

It is an arithmetic number, because the mean of its divisors is an integer number (128707890544).

Almost surely, 2^257415781087 is an apocalyptic number.

257415781087 is a deficient number, since it is larger than the sum of its proper divisors (1).

257415781087 is an equidigital number, since it uses as much as digits as its factorization.

257415781087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4390400, while the sum is 55.

The spelling of 257415781087 in words is "two hundred fifty-seven billion, four hundred fifteen million, seven hundred eighty-one thousand, eighty-seven".