256774218746172 has 48 divisors (see below), whose sum is σ = 630934453443840. Its totient is φ = 81053046772992.

The previous prime is 256774218746167. The next prime is 256774218746203. The reversal of 256774218746172 is 271647812477652.

It is a junction number, because it is equal to n+sod(n) for n = 256774218746097 and 256774218746106.

It is a congruent 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, 232424248 + ... + 233526399.

It is an arithmetic number, because the mean of its divisors is an integer number (13144467780080).

Almost surely, 2^{256774218746172} is an apocalyptic number.

It is an amenable number.

256774218746172 is an abundant number, since it is smaller than the sum of its proper divisors (374160234697668).

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

256774218746172 is a wasteful number, since it uses less digits than its factorization.

256774218746172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465953090 (or 465953088 counting only the distinct ones).

The product of its digits is 442552320, while the sum is 69.

The spelling of 256774218746172 in words is "two hundred fifty-six trillion, seven hundred seventy-four billion, two hundred eighteen million, seven hundred forty-six thousand, one hundred seventy-two".