255515705771 has 4 divisors (see below), whose sum is σ = 257083286952. Its totient is φ = 253948124592.

The previous prime is 255515705749. The next prime is 255515705791. The reversal of 255515705771 is 177507515552.

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 255515705771 - 2³⁴ = 238335836587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255515705791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783790346 + ... + 783790671.

It is an arithmetic number, because the mean of its divisors is an integer number (64270821738).

Almost surely, 2^255515705771 is an apocalyptic number.

255515705771 is a deficient number, since it is larger than the sum of its proper divisors (1567581181).

255515705771 is a wasteful number, since it uses less digits than its factorization.

255515705771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567581180.

The product of its (nonzero) digits is 2143750, while the sum is 50.

The spelling of 255515705771 in words is "two hundred fifty-five billion, five hundred fifteen million, seven hundred five thousand, seven hundred seventy-one".