256681038085 has 16 divisors (see below), whose sum is σ = 309942500544. Its totient is φ = 204061617792.

The previous prime is 256681038073. The next prime is 256681038109. The reversal of 256681038085 is 580830186652.

It is a cyclic number.

It is not a de Polignac number, because 256681038085 - 2⁷ = 256681037957 is a prime.

It is a Duffinian number.

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, 11915134 + ... + 11936656.

It is an arithmetic number, because the mean of its divisors is an integer number (19371406284).

Almost surely, 2^256681038085 is an apocalyptic number.

It is an amenable number.

256681038085 is a deficient number, since it is larger than the sum of its proper divisors (53261462459).

256681038085 is a wasteful number, since it uses less digits than its factorization.

256681038085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36324.

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 256681038085 in words is "two hundred fifty-six billion, six hundred eighty-one million, thirty-eight thousand, eighty-five".