256553447 has 8 divisors (see below), whose sum is σ = 273092400. Its totient is φ = 240318144.

The previous prime is 256553399. The next prime is 256553467. The reversal of 256553447 is 744355652.

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

It is a cyclic number.

It is not a de Polignac number, because 256553447 - 2¹⁴ = 256537063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256553467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74168 + ... + 77549.

It is an arithmetic number, because the mean of its divisors is an integer number (34136550).

Almost surely, 2^256553447 is an apocalyptic number.

256553447 is a deficient number, since it is larger than the sum of its proper divisors (16538953).

256553447 is a wasteful number, since it uses less digits than its factorization.

256553447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151825.

The product of its digits is 504000, while the sum is 41.

The square root of 256553447 is about 16017.2858811972. The cubic root of 256553447 is about 635.4176655798.

The spelling of 256553447 in words is "two hundred fifty-six million, five hundred fifty-three thousand, four hundred forty-seven".