255720919105 has 4 divisors (see below), whose sum is σ = 306865102932. Its totient is φ = 204576735280.

The previous prime is 255720919081. The next prime is 255720919121. The reversal of 255720919105 is 501919027552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88813536256 + 166907382849 = 298016^2 + 408543^2 .

It is not a de Polignac number, because 255720919105 - 2⁵ = 255720919073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25572091906 + ... + 25572091915.

It is an arithmetic number, because the mean of its divisors is an integer number (76716275733).

Almost surely, 2^255720919105 is an apocalyptic number.

It is an amenable number.

255720919105 is a deficient number, since it is larger than the sum of its proper divisors (51144183827).

255720919105 is an equidigital number, since it uses as much as digits as its factorization.

255720919105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51144183826.

The product of its (nonzero) digits is 283500, while the sum is 46.

The spelling of 255720919105 in words is "two hundred fifty-five billion, seven hundred twenty million, nine hundred nineteen thousand, one hundred five".