256449895968 has 48 divisors (see below), whose sum is σ = 769349689920. Its totient is φ = 73271398656.

The previous prime is 256449895939. The next prime is 256449895973. The reversal of 256449895968 is 869598944652.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 256449895968.

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, 190810263 + ... + 190811606.

It is an arithmetic number, because the mean of its divisors is an integer number (16028118540).

Almost surely, 2^256449895968 is an apocalyptic number.

256449895968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256449895968 is an abundant number, since it is smaller than the sum of its proper divisors (512899793952).

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

256449895968 is a wasteful number, since it uses less digits than its factorization.

256449895968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381621889 (or 381621881 counting only the distinct ones).

The product of its digits is 1343692800, while the sum is 75.

The spelling of 256449895968 in words is "two hundred fifty-six billion, four hundred forty-nine million, eight hundred ninety-five thousand, nine hundred sixty-eight".