256373563 has 2 divisors, whose sum is σ = 256373564. Its totient is φ = 256373562.

The previous prime is 256373539. The next prime is 256373569. The reversal of 256373563 is 365373652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256373563 - 2⁵ = 256373531 is a prime.

It is not a weakly prime, because it can be changed into another prime (256373569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128186781 + 128186782.

It is an arithmetic number, because the mean of its divisors is an integer number (128186782).

Almost surely, 2^256373563 is an apocalyptic number.

256373563 is a deficient number, since it is larger than the sum of its proper divisors (1).

256373563 is an equidigital number, since it uses as much as digits as its factorization.

256373563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 40.

The square root of 256373563 is about 16011.6695881473. The cubic root of 256373563 is about 635.2691218781.

The spelling of 256373563 in words is "two hundred fifty-six million, three hundred seventy-three thousand, five hundred sixty-three".