256121792588208 has 20 divisors (see below), whose sum is σ = 661647964186328. Its totient is φ = 85373930862720.

The previous prime is 256121792588203. The next prime is 256121792588209. The reversal of 256121792588208 is 802885297121652.

It is not an unprimeable number, because it can be changed into a prime (256121792588203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667935339413 + ... + 2667935339508.

Almost surely, 2^{256121792588208} is an apocalyptic number.

It is an amenable number.

256121792588208 is an abundant number, since it is smaller than the sum of its proper divisors (405526171598120).

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

256121792588208 is a wasteful number, since it uses less digits than its factorization.

256121792588208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5335870678932 (or 5335870678926 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 66.

The spelling of 256121792588208 in words is "two hundred fifty-six trillion, one hundred twenty-one billion, seven hundred ninety-two million, five hundred eighty-eight thousand, two hundred eight".