256455553 has 4 divisors (see below), whose sum is σ = 256507840. Its totient is φ = 256403268.

The previous prime is 256455541. The next prime is 256455581. The reversal of 256455553 is 355554652.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-256455553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256455503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17925 + ... + 28882.

It is an arithmetic number, because the mean of its divisors is an integer number (64126960).

Almost surely, 2^256455553 is an apocalyptic number.

It is an amenable number.

256455553 is a deficient number, since it is larger than the sum of its proper divisors (52287).

256455553 is an equidigital number, since it uses as much as digits as its factorization.

256455553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52286.

The product of its digits is 450000, while the sum is 40.

The square root of 256455553 is about 16014.2297036105. The cubic root of 256455553 is about 635.3368357812.

Subtracting 256455553 from its reverse (355554652), we obtain a palindrome (99099099).

The spelling of 256455553 in words is "two hundred fifty-six million, four hundred fifty-five thousand, five hundred fifty-three".