256681038086 has 16 divisors (see below), whose sum is σ = 420031517760. Its totient is φ = 116670976680.

The previous prime is 256681038073. The next prime is 256681038109. The reversal of 256681038086 is 680830186652.

It is a congruent number.

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, 1801985 + ... + 1939203.

It is an arithmetic number, because the mean of its divisors is an integer number (26251969860).

Almost surely, 2^256681038086 is an apocalyptic number.

256681038086 is a deficient number, since it is larger than the sum of its proper divisors (163350479674).

256681038086 is a wasteful number, since it uses less digits than its factorization.

256681038086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222259.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 256681038086 in words is "two hundred fifty-six billion, six hundred eighty-one million, thirty-eight thousand, eighty-six".