256553506 has 8 divisors (see below), whose sum is σ = 419814864. Its totient is φ = 116615220.

The previous prime is 256553501. The next prime is 256553567. The reversal of 256553506 is 605355652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (256553501) 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, 5830740 + ... + 5830783.

It is an arithmetic number, because the mean of its divisors is an integer number (52476858).

Almost surely, 2^256553506 is an apocalyptic number.

256553506 is a deficient number, since it is larger than the sum of its proper divisors (163261358).

256553506 is a wasteful number, since it uses less digits than its factorization.

256553506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11661536.

The product of its (nonzero) digits is 135000, while the sum is 37.

The square root of 256553506 is about 16017.2877229573. The cubic root of 256553506 is about 635.4177142892.

It can be divided in two parts, 25655 and 3506, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 256553506 in words is "two hundred fifty-six million, five hundred fifty-three thousand, five hundred six".