256705250120 has 128 divisors (see below), whose sum is σ = 650720563200. Its totient is φ = 90294470400.

The previous prime is 256705250111. The next prime is 256705250147. The reversal of 256705250120 is 21052507652.

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, 56453687 + ... + 56458233.

It is an arithmetic number, because the mean of its divisors is an integer number (5083754400).

Almost surely, 2^256705250120 is an apocalyptic number.

256705250120 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 256705250120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325360281600).

256705250120 is an abundant number, since it is smaller than the sum of its proper divisors (394015313080).

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

256705250120 is a wasteful number, since it uses less digits than its factorization.

256705250120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739 (or 8735 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

Adding to 256705250120 its reverse (21052507652), we get a palindrome (277757757772).

The spelling of 256705250120 in words is "two hundred fifty-six billion, seven hundred five million, two hundred fifty thousand, one hundred twenty".