257464661 has 2 divisors, whose sum is σ = 257464662. Its totient is φ = 257464660.

The previous prime is 257464651. The next prime is 257464679. The reversal of 257464661 is 166464752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252651025 + 4813636 = 15895^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 257464661 - 2¹⁰ = 257463637 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257464601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128732330 + 128732331.

It is an arithmetic number, because the mean of its divisors is an integer number (128732331).

Almost surely, 2^257464661 is an apocalyptic number.

It is an amenable number.

257464661 is a deficient number, since it is larger than the sum of its proper divisors (1).

257464661 is an equidigital number, since it uses as much as digits as its factorization.

257464661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 41.

The square root of 257464661 is about 16045.7053755826. The cubic root of 257464661 is about 636.1690585016.

Subtracting from 257464661 its reverse (166464752), we obtain a palindrome (90999909).

The spelling of 257464661 in words is "two hundred fifty-seven million, four hundred sixty-four thousand, six hundred sixty-one".