256562553 has 16 divisors (see below), whose sum is σ = 376967360. Its totient is φ = 154211904.

The previous prime is 256562531. The next prime is 256562557. The reversal of 256562553 is 355265652.

It is not a de Polignac number, because 256562553 - 2²⁰ = 255513977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256562557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74818 + ... + 78171.

It is an arithmetic number, because the mean of its divisors is an integer number (23560460).

Almost surely, 2^256562553 is an apocalyptic number.

It is an amenable number.

256562553 is a deficient number, since it is larger than the sum of its proper divisors (120404807).

256562553 is a wasteful number, since it uses less digits than its factorization.

256562553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153048.

The product of its digits is 270000, while the sum is 39.

The square root of 256562553 is about 16017.5701340746. The cubic root of 256562553 is about 635.4251832399.

The spelling of 256562553 in words is "two hundred fifty-six million, five hundred sixty-two thousand, five hundred fifty-three".