256320660404 has 6 divisors (see below), whose sum is σ = 448561155714. Its totient is φ = 128160330200.

The previous prime is 256320660383. The next prime is 256320660439. The reversal of 256320660404 is 404066023652.

It can be written as a sum of positive squares in only one way, i.e., 190748815504 + 65571844900 = 436748^2 + 256070^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32040082547 + ... + 32040082554.

It is an arithmetic number, because the mean of its divisors is an integer number (74760192619).

Almost surely, 2^256320660404 is an apocalyptic number.

It is an amenable number.

256320660404 is a deficient number, since it is larger than the sum of its proper divisors (192240495310).

256320660404 is a wasteful number, since it uses less digits than its factorization.

256320660404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64080165105 (or 64080165103 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 256320660404 in words is "two hundred fifty-six billion, three hundred twenty million, six hundred sixty thousand, four hundred four".