256163251867 has 2 divisors, whose sum is σ = 256163251868. Its totient is φ = 256163251866.

The previous prime is 256163251853. The next prime is 256163251871. The reversal of 256163251867 is 768152361652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256163251867 is a prime.

It is a super-2 number, since 2×256163251867² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256163251807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128081625933 + 128081625934.

It is an arithmetic number, because the mean of its divisors is an integer number (128081625934).

Almost surely, 2^256163251867 is an apocalyptic number.

256163251867 is a deficient number, since it is larger than the sum of its proper divisors (1).

256163251867 is an equidigital number, since it uses as much as digits as its factorization.

256163251867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 52.

The spelling of 256163251867 in words is "two hundred fifty-six billion, one hundred sixty-three million, two hundred fifty-one thousand, eight hundred sixty-seven".