256550657 has 4 divisors (see below), whose sum is σ = 279873456. Its totient is φ = 233227860.

The previous prime is 256550641. The next prime is 256550659. The reversal of 256550657 is 756055652.

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 256550657 - 2⁴ = 256550641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256550659) 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, 11661383 + ... + 11661404.

It is an arithmetic number, because the mean of its divisors is an integer number (69968364).

Almost surely, 2^256550657 is an apocalyptic number.

It is an amenable number.

256550657 is a deficient number, since it is larger than the sum of its proper divisors (23322799).

256550657 is a wasteful number, since it uses less digits than its factorization.

256550657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23322798.

The product of its (nonzero) digits is 315000, while the sum is 41.

The square root of 256550657 is about 16017.1987875533. The cubic root of 256550657 is about 635.4153621979.

The spelling of 256550657 in words is "two hundred fifty-six million, five hundred fifty thousand, six hundred fifty-seven".