257624669 has 2 divisors, whose sum is σ = 257624670. Its totient is φ = 257624668.

The previous prime is 257624659. The next prime is 257624677. The reversal of 257624669 is 966426752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254785444 + 2839225 = 15962^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 257624669 - 2⁸ = 257624413 is a prime.

It is a super-2 number, since 2×257624669² = 132740940154719122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257624659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128812334 + 128812335.

It is an arithmetic number, because the mean of its divisors is an integer number (128812335).

Almost surely, 2^257624669 is an apocalyptic number.

It is an amenable number.

257624669 is a deficient number, since it is larger than the sum of its proper divisors (1).

257624669 is an equidigital number, since it uses as much as digits as its factorization.

257624669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 47.

The square root of 257624669 is about 16050.6906081950. The cubic root of 257624669 is about 636.3008190554.

The spelling of 257624669 in words is "two hundred fifty-seven million, six hundred twenty-four thousand, six hundred sixty-nine".