255853872399 has 16 divisors (see below), whose sum is σ = 343876668800. Its totient is φ = 169202190816.

The previous prime is 255853872359. The next prime is 255853872401. The reversal of 255853872399 is 993278358552.

It is a happy number.

It is a Cunningham number, because it is equal to 505820²-1.

It is not a de Polignac number, because 255853872399 - 2²⁰ = 255852823823 is a prime.

It is a super-2 number, since 2×255853872399² (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 (255853872359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252912 + ... + 758730.

It is an arithmetic number, because the mean of its divisors is an integer number (21492291800).

Almost surely, 2^255853872399 is an apocalyptic number.

255853872399 is a deficient number, since it is larger than the sum of its proper divisors (88022796401).

255853872399 is a wasteful number, since it uses less digits than its factorization.

255853872399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507174.

The product of its digits is 163296000, while the sum is 66.

The spelling of 255853872399 in words is "two hundred fifty-five billion, eight hundred fifty-three million, eight hundred seventy-two thousand, three hundred ninety-nine".