256639061425 has 6 divisors (see below), whose sum is σ = 318232436198. Its totient is φ = 205311249120.

The previous prime is 256639061417. The next prime is 256639061453. The reversal of 256639061425 is 524160936652.

256639061425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1080502641 + 255558558784 = 32871^2 + 505528^2 .

It is not a de Polignac number, because 256639061425 - 2³ = 256639061417 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 5132781204 + ... + 5132781253.

Almost surely, 2^256639061425 is an apocalyptic number.

256639061425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256639061425 is a deficient number, since it is larger than the sum of its proper divisors (61593374773).

256639061425 is a wasteful number, since it uses less digits than its factorization.

256639061425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10265562467 (or 10265562462 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 256639061425 in words is "two hundred fifty-six billion, six hundred thirty-nine million, sixty-one thousand, four hundred twenty-five".