257449663 has 4 divisors (see below), whose sum is σ = 264407800. Its totient is φ = 250491528.

The previous prime is 257449657. The next prime is 257449669. The reversal of 257449663 is 366944752.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (257449657) and next prime (257449669).

It is a cyclic number.

It is not a de Polignac number, because 257449663 - 2⁵ = 257449631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257449669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3479013 + ... + 3479086.

It is an arithmetic number, because the mean of its divisors is an integer number (66101950).

Almost surely, 2^257449663 is an apocalyptic number.

257449663 is a deficient number, since it is larger than the sum of its proper divisors (6958137).

257449663 is an equidigital number, since it uses as much as digits as its factorization.

257449663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6958136.

The product of its digits is 1088640, while the sum is 46.

The square root of 257449663 is about 16045.2380163088. The cubic root of 257449663 is about 636.1567054163.

The spelling of 257449663 in words is "two hundred fifty-seven million, four hundred forty-nine thousand, six hundred sixty-three".