256998742086 has 32 divisors (see below), whose sum is σ = 521373312000. Its totient is φ = 84440566080.

The previous prime is 256998742061. The next prime is 256998742109. The reversal of 256998742086 is 680247899652.

256998742086 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168655 + ... + 736506.

It is an arithmetic number, because the mean of its divisors is an integer number (16292916000).

Almost surely, 2^256998742086 is an apocalyptic number.

256998742086 is an abundant number, since it is smaller than the sum of its proper divisors (264374569914).

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

256998742086 is a wasteful number, since it uses less digits than its factorization.

256998742086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905844.

The product of its (nonzero) digits is 104509440, while the sum is 66.

The spelling of 256998742086 in words is "two hundred fifty-six billion, nine hundred ninety-eight million, seven hundred forty-two thousand, eighty-six".