255717403919 has 4 divisors (see below), whose sum is σ = 262628685144. Its totient is φ = 248806122696.

The previous prime is 255717403897. The next prime is 255717403937. The reversal of 255717403919 is 919304717552.

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 255717403919 - 2⁸ = 255717403663 is a prime.

It is a super-2 number, since 2×255717403919² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255717403979) 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, 3455640557 + ... + 3455640630.

It is an arithmetic number, because the mean of its divisors is an integer number (65657171286).

Almost surely, 2^255717403919 is an apocalyptic number.

255717403919 is a deficient number, since it is larger than the sum of its proper divisors (6911281225).

255717403919 is an equidigital number, since it uses as much as digits as its factorization.

255717403919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911281224.

The product of its (nonzero) digits is 2381400, while the sum is 53.

The spelling of 255717403919 in words is "two hundred fifty-five billion, seven hundred seventeen million, four hundred three thousand, nine hundred nineteen".