257866067 has 2 divisors, whose sum is σ = 257866068. Its totient is φ = 257866066.

The previous prime is 257866051. The next prime is 257866073. The reversal of 257866067 is 760668752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257866067 - 2⁴ = 257866051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257866667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128933033 + 128933034.

It is an arithmetic number, because the mean of its divisors is an integer number (128933034).

Almost surely, 2^257866067 is an apocalyptic number.

257866067 is a deficient number, since it is larger than the sum of its proper divisors (1).

257866067 is an equidigital number, since it uses as much as digits as its factorization.

257866067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 47.

The square root of 257866067 is about 16058.2087108120. The cubic root of 257866067 is about 636.4994980030.

The spelling of 257866067 in words is "two hundred fifty-seven million, eight hundred sixty-six thousand, sixty-seven".