256156663 has 12 divisors (see below), whose sum is σ = 315507312. Its totient is φ = 206646720.

The previous prime is 256156639. The next prime is 256156673. The reversal of 256156663 is 366651652.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-256156663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256156603) 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 11 ways as a sum of consecutive naturals, for example, 152923 + ... + 154588.

It is an arithmetic number, because the mean of its divisors is an integer number (26292276).

Almost surely, 2^256156663 is an apocalyptic number.

256156663 is a deficient number, since it is larger than the sum of its proper divisors (59350649).

256156663 is a wasteful number, since it uses less digits than its factorization.

256156663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307542 (or 307535 counting only the distinct ones).

The product of its digits is 194400, while the sum is 40.

The square root of 256156663 is about 16004.8949699772. The cubic root of 256156663 is about 635.0899188597.

The spelling of 256156663 in words is "two hundred fifty-six million, one hundred fifty-six thousand, six hundred sixty-three".