256817225135 has 8 divisors (see below), whose sum is σ = 308342286576. Its totient is φ = 205346035840.

The previous prime is 256817225099. The next prime is 256817225167. The reversal of 256817225135 is 531522718652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256817225135 - 2³⁰ = 255743483311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256817225135.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13457546 + ... + 13476615.

It is an arithmetic number, because the mean of its divisors is an integer number (38542785822).

Almost surely, 2^256817225135 is an apocalyptic number.

256817225135 is a deficient number, since it is larger than the sum of its proper divisors (51525061441).

256817225135 is a wasteful number, since it uses less digits than its factorization.

256817225135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26936073.

The product of its digits is 1008000, while the sum is 47.

The spelling of 256817225135 in words is "two hundred fifty-six billion, eight hundred seventeen million, two hundred twenty-five thousand, one hundred thirty-five".