256563723 has 8 divisors (see below), whose sum is σ = 368399248. Its totient is φ = 157885344.

The previous prime is 256563721. The next prime is 256563731. The reversal of 256563723 is 327365652.

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

It is not a de Polignac number, because 256563723 - 2¹ = 256563721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 6578557 = 256563723 / (2 + 5 + 6 + 5 + 6 + 3 + 7 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256563721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3289240 + ... + 3289317.

It is an arithmetic number, because the mean of its divisors is an integer number (46049906).

Almost surely, 2^256563723 is an apocalyptic number.

256563723 is a deficient number, since it is larger than the sum of its proper divisors (111835525).

256563723 is a wasteful number, since it uses less digits than its factorization.

256563723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6578573.

The product of its digits is 226800, while the sum is 39.

The square root of 256563723 is about 16017.6066564265. The cubic root of 256563723 is about 635.4261491464.

The spelling of 256563723 in words is "two hundred fifty-six million, five hundred sixty-three thousand, seven hundred twenty-three".