256809374785 has 8 divisors (see below), whose sum is σ = 308176393536. Its totient is φ = 205444070640.

The previous prime is 256809374779. The next prime is 256809374813. The reversal of 256809374785 is 587473908652.

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

It is not a de Polignac number, because 256809374785 - 2⁹ = 256809374273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72189 + ... + 720298.

It is an arithmetic number, because the mean of its divisors is an integer number (38522049192).

Almost surely, 2^256809374785 is an apocalyptic number.

It is an amenable number.

256809374785 is a deficient number, since it is larger than the sum of its proper divisors (51367018751).

256809374785 is an equidigital number, since it uses as much as digits as its factorization.

256809374785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857303.

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 256809374785 in words is "two hundred fifty-six billion, eight hundred nine million, three hundred seventy-four thousand, seven hundred eighty-five".