257790553 has 4 divisors (see below), whose sum is σ = 257959168. Its totient is φ = 257621940.

The previous prime is 257790539. The next prime is 257790593. The reversal of 257790553 is 355097752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257790553 - 2¹⁷ = 257659481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257790523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81993 + ... + 85078.

It is an arithmetic number, because the mean of its divisors is an integer number (64489792).

Almost surely, 2^257790553 is an apocalyptic number.

It is an amenable number.

257790553 is a deficient number, since it is larger than the sum of its proper divisors (168615).

257790553 is a wasteful number, since it uses less digits than its factorization.

257790553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168614.

The product of its (nonzero) digits is 330750, while the sum is 43.

The square root of 257790553 is about 16055.8572801330. The cubic root of 257790553 is about 636.4373606873.

The spelling of 257790553 in words is "two hundred fifty-seven million, seven hundred ninety thousand, five hundred fifty-three".