256167563 has 4 divisors (see below), whose sum is σ = 256759608. Its totient is φ = 255575520.

The previous prime is 256167559. The next prime is 256167581. The reversal of 256167563 is 365761652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256167563 - 2² = 256167559 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 256167563.

It is not an unprimeable number, because it can be changed into a prime (256167463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295373 + ... + 296238.

It is an arithmetic number, because the mean of its divisors is an integer number (64189902).

Almost surely, 2^256167563 is an apocalyptic number.

256167563 is a deficient number, since it is larger than the sum of its proper divisors (592045).

256167563 is an equidigital number, since it uses as much as digits as its factorization.

256167563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592044.

The product of its digits is 226800, while the sum is 41.

The square root of 256167563 is about 16005.2354871773. The cubic root of 256167563 is about 635.0989268652.

The spelling of 256167563 in words is "two hundred fifty-six million, one hundred sixty-seven thousand, five hundred sixty-three".