255766555 has 16 divisors (see below), whose sum is σ = 349380864. Its totient is φ = 177923680.

The previous prime is 255766549. The next prime is 255766561. The reversal of 255766555 is 555667552.

It is an interprime number because it is at equal distance from previous prime (255766549) and next prime (255766561).

It is a de Polignac number, because none of the positive numbers 2^k-255766555 is a prime.

It is a Duffinian 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, 99829 + ... + 102358.

It is an arithmetic number, because the mean of its divisors is an integer number (21836304).

Almost surely, 2^255766555 is an apocalyptic number.

255766555 is a deficient number, since it is larger than the sum of its proper divisors (93614309).

255766555 is a wasteful number, since it uses less digits than its factorization.

255766555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202226.

The product of its digits is 1575000, while the sum is 46.

The square root of 255766555 is about 15992.7031798880. The cubic root of 255766555 is about 634.7673564455.

It can be divided in two parts, 25576 and 6555, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 255766555 in words is "two hundred fifty-five million, seven hundred sixty-six thousand, five hundred fifty-five".