255815985967 has 4 divisors (see below), whose sum is σ = 256324566960. Its totient is φ = 255307404976.

The previous prime is 255815985911. The next prime is 255815985973. The reversal of 255815985967 is 769589518552.

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 255815985967 - 2²⁷ = 255681768239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255815985896 and 255815985905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255815985977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254289742 + ... + 254290747.

It is an arithmetic number, because the mean of its divisors is an integer number (64081141740).

Almost surely, 2^255815985967 is an apocalyptic number.

255815985967 is a deficient number, since it is larger than the sum of its proper divisors (508580993).

255815985967 is an equidigital number, since it uses as much as digits as its factorization.

255815985967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508580992.

The product of its digits is 272160000, while the sum is 70.

The spelling of 255815985967 in words is "two hundred fifty-five billion, eight hundred fifteen million, nine hundred eighty-five thousand, nine hundred sixty-seven".