255515705815 has 16 divisors (see below), whose sum is σ = 307630452096. Its totient is φ = 203739091200.

The previous prime is 255515705791. The next prime is 255515705839. The reversal of 255515705815 is 518507515552.

It is an interprime number because it is at equal distance from previous prime (255515705791) and next prime (255515705839).

It is not a de Polignac number, because 255515705815 - 2⁹ = 255515705303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2168725 + ... + 2283505.

It is an arithmetic number, because the mean of its divisors is an integer number (19226903256).

Almost surely, 2^255515705815 is an apocalyptic number.

255515705815 is a deficient number, since it is larger than the sum of its proper divisors (52114746281).

255515705815 is a wasteful number, since it uses less digits than its factorization.

255515705815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116250.

The product of its (nonzero) digits is 1750000, while the sum is 49.

The spelling of 255515705815 in words is "two hundred fifty-five billion, five hundred fifteen million, seven hundred five thousand, eight hundred fifteen".