256656135 has 8 divisors (see below), whose sum is σ = 410649840. Its totient is φ = 136883264.

The previous prime is 256656091. The next prime is 256656137. The reversal of 256656135 is 531656652.

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

It is a cyclic number.

It is not a de Polignac number, because 256656135 - 2⁸ = 256655879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256656093 and 256656102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256656137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8555190 + ... + 8555219.

It is an arithmetic number, because the mean of its divisors is an integer number (51331230).

Almost surely, 2^256656135 is an apocalyptic number.

256656135 is a deficient number, since it is larger than the sum of its proper divisors (153993705).

256656135 is a wasteful number, since it uses less digits than its factorization.

256656135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17110417.

The product of its digits is 162000, while the sum is 39.

The square root of 256656135 is about 16020.4910973416. The cubic root of 256656135 is about 635.5024316280.

The spelling of 256656135 in words is "two hundred fifty-six million, six hundred fifty-six thousand, one hundred thirty-five".