256900555 has 4 divisors (see below), whose sum is σ = 308280672. Its totient is φ = 205520440.

The previous prime is 256900537. The next prime is 256900559. The reversal of 256900555 is 555009652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 256900555 - 2¹¹ = 256898507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256900559) 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, 25690051 + ... + 25690060.

It is an arithmetic number, because the mean of its divisors is an integer number (77070168).

Almost surely, 2^256900555 is an apocalyptic number.

256900555 is a deficient number, since it is larger than the sum of its proper divisors (51380117).

256900555 is an equidigital number, since it uses as much as digits as its factorization.

256900555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51380116.

The product of its (nonzero) digits is 67500, while the sum is 37.

The square root of 256900555 is about 16028.1176374520. The cubic root of 256900555 is about 635.7041025295.

The spelling of 256900555 in words is "two hundred fifty-six million, nine hundred thousand, five hundred fifty-five".