256317936486 has 32 divisors (see below), whose sum is σ = 530364188160. Its totient is φ = 82485162144.

The previous prime is 256317936473. The next prime is 256317936517. The reversal of 256317936486 is 684639713652.

It is a super-2 number, since 2×256317936486² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1890771 + ... + 2021793.

It is an arithmetic number, because the mean of its divisors is an integer number (16573880880).

Almost surely, 2^256317936486 is an apocalyptic number.

256317936486 is an abundant number, since it is smaller than the sum of its proper divisors (274046251674).

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

256317936486 is a wasteful number, since it uses less digits than its factorization.

256317936486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142300.

The product of its digits is 39191040, while the sum is 60.

The spelling of 256317936486 in words is "two hundred fifty-six billion, three hundred seventeen million, nine hundred thirty-six thousand, four hundred eighty-six".