256316220053720 has 128 divisors (see below), whose sum is σ = 596993358844800. Its totient is φ = 98925528059904.

The previous prime is 256316220053683. The next prime is 256316220053759. The reversal of 256316220053720 is 27350022613652.

256316220053720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23508773789 + ... + 23508784691.

It is an arithmetic number, because the mean of its divisors is an integer number (4664010615975).

Almost surely, 2^{256316220053720} is an apocalyptic number.

256316220053720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256316220053720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298496679422400).

256316220053720 is an abundant number, since it is smaller than the sum of its proper divisors (340677138791080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256316220053720 is a wasteful number, since it uses less digits than its factorization.

256316220053720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22509 (or 22505 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 256316220053720 in words is "two hundred fifty-six trillion, three hundred sixteen billion, two hundred twenty million, fifty-three thousand, seven hundred twenty".