256577253 has 8 divisors (see below), whose sum is σ = 347901600. Its totient is φ = 168152208.

The previous prime is 256577249. The next prime is 256577257. The reversal of 256577253 is 352775652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256577249) and next prime (256577257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256577253 - 2² = 256577249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256577257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724618 + ... + 724971.

It is an arithmetic number, because the mean of its divisors is an integer number (43487700).

Almost surely, 2^256577253 is an apocalyptic number.

It is an amenable number.

256577253 is a deficient number, since it is larger than the sum of its proper divisors (91324347).

256577253 is a wasteful number, since it uses less digits than its factorization.

256577253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449651.

The product of its digits is 441000, while the sum is 42.

The square root of 256577253 is about 16018.0289986003. The cubic root of 256577253 is about 635.4373187753.

The spelling of 256577253 in words is "two hundred fifty-six million, five hundred seventy-seven thousand, two hundred fifty-three".