256040163 has 16 divisors (see below), whose sum is σ = 395811840. Its totient is φ = 163271592.

The previous prime is 256040137. The next prime is 256040171. The reversal of 256040163 is 361040652.

256040163 is a `hidden beast` number, since 2 + 560 + 40 + 1 + 63 = 666.

It is not a de Polignac number, because 256040163 - 2¹⁰ = 256039139 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (256040063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205531 + ... + 206772.

It is an arithmetic number, because the mean of its divisors is an integer number (24738240).

Almost surely, 2^256040163 is an apocalyptic number.

256040163 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

256040163 is a deficient number, since it is larger than the sum of its proper divisors (139771677).

256040163 is a wasteful number, since it uses less digits than its factorization.

256040163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412335 (or 412329 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 256040163 is about 16001.2550445270. The cubic root of 256040163 is about 634.9936246699.

The spelling of 256040163 in words is "two hundred fifty-six million, forty thousand, one hundred sixty-three".