256104971808 has 96 divisors (see below), whose sum is σ = 768397271040. Its totient is φ = 73165006080.

The previous prime is 256104971803. The next prime is 256104971867. The reversal of 256104971808 is 808179401652.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (256104971803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9676353 + ... + 9702783.

It is an arithmetic number, because the mean of its divisors is an integer number (8004138240).

Almost surely, 2^256104971808 is an apocalyptic number.

256104971808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256104971808 is an abundant number, since it is smaller than the sum of its proper divisors (512292299232).

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

256104971808 is a wasteful number, since it uses less digits than its factorization.

256104971808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40870 (or 40862 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 256104971808 in words is "two hundred fifty-six billion, one hundred four million, nine hundred seventy-one thousand, eight hundred eight".