256523857980 has 96 divisors (see below), whose sum is σ = 773616152064. Its totient is φ = 63136329984.

The previous prime is 256523857973. The next prime is 256523857999. The reversal of 256523857980 is 89758325652.

It is a happy number.

256523857980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8226699 + ... + 8257821.

It is an arithmetic number, because the mean of its divisors is an integer number (8058501584).

Almost surely, 2^256523857980 is an apocalyptic number.

256523857980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256523857980 is an abundant number, since it is smaller than the sum of its proper divisors (517092294084).

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

256523857980 is a wasteful number, since it uses less digits than its factorization.

256523857980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41715 (or 41713 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 60.

The spelling of 256523857980 in words is "two hundred fifty-six billion, five hundred twenty-three million, eight hundred fifty-seven thousand, nine hundred eighty".