255778027809 has 4 divisors (see below), whose sum is σ = 341037370416. Its totient is φ = 170518685204.

The previous prime is 255778027807. The next prime is 255778027823. The reversal of 255778027809 is 908720877552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255778027809 - 2¹ = 255778027807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255778027807) 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, 42629671299 + ... + 42629671304.

It is an arithmetic number, because the mean of its divisors is an integer number (85259342604).

Almost surely, 2^255778027809 is an apocalyptic number.

It is an amenable number.

255778027809 is a deficient number, since it is larger than the sum of its proper divisors (85259342607).

255778027809 is an equidigital number, since it uses as much as digits as its factorization.

255778027809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85259342606.

The product of its (nonzero) digits is 19756800, while the sum is 60.

The spelling of 255778027809 in words is "two hundred fifty-five billion, seven hundred seventy-eight million, twenty-seven thousand, eight hundred nine".