256778239180 has 24 divisors (see below), whose sum is σ = 539299393920. Its totient is φ = 102698897280.

The previous prime is 256778239171. The next prime is 256778239231. The reversal of 256778239180 is 81932877652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604156 + ... + 937315.

It is an arithmetic number, because the mean of its divisors is an integer number (22470808080).

Almost surely, 2^256778239180 is an apocalyptic number.

256778239180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256778239180 is an abundant number, since it is smaller than the sum of its proper divisors (282521154740).

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

256778239180 is a wasteful number, since it uses less digits than its factorization.

256778239180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549809 (or 1549807 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 256778239180 in words is "two hundred fifty-six billion, seven hundred seventy-eight million, two hundred thirty-nine thousand, one hundred eighty".