256822742834785 has 16 divisors (see below), whose sum is σ = 308218522412736. Its totient is φ = 205437374670528.

The previous prime is 256822742834741. The next prime is 256822742834849. The reversal of 256822742834785 is 587438247228652.

256822742834785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256822742834785 - 2¹⁷ = 256822742703713 is a prime.

It is a super-2 number, since 2×256822742834785² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3530998279 + ... + 3531071011.

It is an arithmetic number, because the mean of its divisors is an integer number (19263657650796).

Almost surely, 2^{256822742834785} is an apocalyptic number.

It is an amenable number.

256822742834785 is a deficient number, since it is larger than the sum of its proper divisors (51395779577951).

256822742834785 is a wasteful number, since it uses less digits than its factorization.

256822742834785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134592.

The product of its digits is 2890137600, while the sum is 73.

The spelling of 256822742834785 in words is "two hundred fifty-six trillion, eight hundred twenty-two billion, seven hundred forty-two million, eight hundred thirty-four thousand, seven hundred eighty-five".