256673655 has 48 divisors (see below), whose sum is σ = 511680000. Its totient is φ = 116593344.

The previous prime is 256673611. The next prime is 256673657. The reversal of 256673655 is 556376652.

256673655 is a `hidden beast` number, since 2 + 566 + 7 + 36 + 55 = 666.

It is not a de Polignac number, because 256673655 - 2⁹ = 256673143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 256673655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256673657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48846 + ... + 53844.

It is an arithmetic number, because the mean of its divisors is an integer number (10660000).

Almost surely, 2^256673655 is an apocalyptic number.

256673655 is a deficient number, since it is larger than the sum of its proper divisors (255006345).

256673655 is a wasteful number, since it uses less digits than its factorization.

256673655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180 (or 5177 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 45.

The square root of 256673655 is about 16021.0378877275. The cubic root of 256673655 is about 635.5168916360.

The spelling of 256673655 in words is "two hundred fifty-six million, six hundred seventy-three thousand, six hundred fifty-five".