256542882885 has 40 divisors (see below), whose sum is σ = 471093411096. Its totient is φ = 133485719040.

The previous prime is 256542882833. The next prime is 256542882907. The reversal of 256542882885 is 588288245652.

256542882885 is a `hidden beast` number, since 2 + 5 + 6 + 542 + 8 + 8 + 2 + 8 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 718347204 + 255824535681 = 26802^2 + 505791^2 .

It is not a de Polignac number, because 256542882885 - 2¹² = 256542878789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7708264 + ... + 7741473.

Almost surely, 2^256542882885 is an apocalyptic number.

It is an amenable number.

256542882885 is a deficient number, since it is larger than the sum of its proper divisors (214550528211).

256542882885 is a wasteful number, since it uses less digits than its factorization.

256542882885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15449795 (or 15449786 counting only the distinct ones).

The product of its digits is 98304000, while the sum is 63.

The spelling of 256542882885 in words is "two hundred fifty-six billion, five hundred forty-two million, eight hundred eighty-two thousand, eight hundred eighty-five".