257480661 has 16 divisors (see below), whose sum is σ = 349747200. Its totient is φ = 168444528.

The previous prime is 257480659. The next prime is 257480687. The reversal of 257480661 is 166084752.

It is not a de Polignac number, because 257480661 - 2¹ = 257480659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257480621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145500 + ... + 147258.

It is an arithmetic number, because the mean of its divisors is an integer number (21859200).

Almost surely, 2^257480661 is an apocalyptic number.

It is an amenable number.

257480661 is a deficient number, since it is larger than the sum of its proper divisors (92266539).

257480661 is a wasteful number, since it uses less digits than its factorization.

257480661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 257480661 is about 16046.2039436123. The cubic root of 257480661 is about 636.1822363543.

The spelling of 257480661 in words is "two hundred fifty-seven million, four hundred eighty thousand, six hundred sixty-one".