256388593139 has 16 divisors (see below), whose sum is σ = 311166958080. Its totient is φ = 206352800640.

The previous prime is 256388593121. The next prime is 256388593147. The reversal of 256388593139 is 931395883652.

It is not a de Polignac number, because 256388593139 - 2⁸ = 256388592883 is a prime.

It is a super-2 number, since 2×256388593139² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256388593199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8514767 + ... + 8544824.

It is an arithmetic number, because the mean of its divisors is an integer number (19447934880).

Almost surely, 2^256388593139 is an apocalyptic number.

256388593139 is a deficient number, since it is larger than the sum of its proper divisors (54778364941).

256388593139 is a wasteful number, since it uses less digits than its factorization.

256388593139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17059730.

The product of its digits is 41990400, while the sum is 62.

The spelling of 256388593139 in words is "two hundred fifty-six billion, three hundred eighty-eight million, five hundred ninety-three thousand, one hundred thirty-nine".