255999646603 has 4 divisors (see below), whose sum is σ = 256103756280. Its totient is φ = 255895536928.

The previous prime is 255999646561. The next prime is 255999646613. The reversal of 255999646603 is 306646999552.

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 255999646603 - 2¹⁷ = 255999515531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255999646613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52051150 + ... + 52056067.

It is an arithmetic number, because the mean of its divisors is an integer number (64025939070).

Almost surely, 2^255999646603 is an apocalyptic number.

255999646603 is a deficient number, since it is larger than the sum of its proper divisors (104109677).

255999646603 is a wasteful number, since it uses less digits than its factorization.

255999646603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104109676.

The product of its (nonzero) digits is 94478400, while the sum is 64.

The spelling of 255999646603 in words is "two hundred fifty-five billion, nine hundred ninety-nine million, six hundred forty-six thousand, six hundred three".