256858553 has 4 divisors (see below), whose sum is σ = 293552640. Its totient is φ = 220164468.

The previous prime is 256858541. The next prime is 256858561. The reversal of 256858553 is 355858652.

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 256858553 - 2⁸ = 256858297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256858498 and 256858507.

It is not an unprimeable number, because it can be changed into a prime (256858513) 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, 18347033 + ... + 18347046.

It is an arithmetic number, because the mean of its divisors is an integer number (73388160).

Almost surely, 2^256858553 is an apocalyptic number.

It is an amenable number.

256858553 is a deficient number, since it is larger than the sum of its proper divisors (36694087).

256858553 is an equidigital number, since it uses as much as digits as its factorization.

256858553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36694086.

The product of its digits is 1440000, while the sum is 47.

The square root of 256858553 is about 16026.8073239807. The cubic root of 256858553 is about 635.6694557911.

Subtracting 256858553 from its reverse (355858652), we obtain a palindrome (99000099).

The spelling of 256858553 in words is "two hundred fifty-six million, eight hundred fifty-eight thousand, five hundred fifty-three".