256355253 has 32 divisors (see below), whose sum is σ = 473502720. Its totient is φ = 133170480.

The previous prime is 256355251. The next prime is 256355261. The reversal of 256355253 is 352553652.

256355253 is a `hidden beast` number, since 2 + 56 + 3 + 552 + 53 = 666.

It is not a de Polignac number, because 256355253 - 2¹ = 256355251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256355251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59575 + ... + 63732.

It is an arithmetic number, because the mean of its divisors is an integer number (14796960).

Almost surely, 2^256355253 is an apocalyptic number.

It is an amenable number.

256355253 is a deficient number, since it is larger than the sum of its proper divisors (217147467).

256355253 is a wasteful number, since it uses less digits than its factorization.

256355253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123334 (or 123328 counting only the distinct ones).

The product of its digits is 135000, while the sum is 36.

The square root of 256355253 is about 16011.0978074584. The cubic root of 256355253 is about 635.2539980429.

The spelling of 256355253 in words is "two hundred fifty-six million, three hundred fifty-five thousand, two hundred fifty-three".