257695566067 has 2 divisors, whose sum is σ = 257695566068. Its totient is φ = 257695566066.

The previous prime is 257695566061. The next prime is 257695566071. The reversal of 257695566067 is 760665596752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257695566067 - 2²³ = 257687177459 is a prime.

It is not a weakly prime, because it can be changed into another prime (257695566061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128847783033 + 128847783034.

It is an arithmetic number, because the mean of its divisors is an integer number (128847783034).

Almost surely, 2^257695566067 is an apocalyptic number.

257695566067 is a deficient number, since it is larger than the sum of its proper divisors (1).

257695566067 is an equidigital number, since it uses as much as digits as its factorization.

257695566067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884000, while the sum is 64.

The spelling of 257695566067 in words is "two hundred fifty-seven billion, six hundred ninety-five million, five hundred sixty-six thousand, sixty-seven".