255507707405 has 4 divisors (see below), whose sum is σ = 306609248892. Its totient is φ = 204406165920.

The previous prime is 255507707369. The next prime is 255507707419. The reversal of 255507707405 is 504707705552.

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 102894034441 + 152613672964 = 320771^2 + 390658^2 .

It is not a de Polignac number, because 255507707405 - 2¹⁰ = 255507706381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255507707405.

It is a congruent 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, 25550770736 + ... + 25550770745.

It is an arithmetic number, because the mean of its divisors is an integer number (76652312223).

Almost surely, 2^255507707405 is an apocalyptic number.

It is an amenable number.

255507707405 is a deficient number, since it is larger than the sum of its proper divisors (51101541487).

255507707405 is an equidigital number, since it uses as much as digits as its factorization.

255507707405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51101541486.

The product of its (nonzero) digits is 1715000, while the sum is 47.

The spelling of 255507707405 in words is "two hundred fifty-five billion, five hundred seven million, seven hundred seven thousand, four hundred five".