255616 has 16 divisors (see below), whose sum is σ = 509490. Its totient is φ = 127744.

The previous prime is 255613. The next prime is 255617. The reversal of 255616 is 616552.

It can be written as a sum of positive squares in only one way, i.e., 254016 + 1600 = 504^2 + 40^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (255613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 871 + ... + 1126.

2²⁵⁵⁶¹⁶ is an apocalyptic number.

It is an amenable number.

255616 is a deficient number, since it is larger than the sum of its proper divisors (253874).

255616 is an equidigital number, since it uses as much as digits as its factorization.

255616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011 (or 1999 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 255616 is about 505.5848098984. The cubic root of 255616 is about 63.4642781704.

It can be divided in two parts, 255 and 616, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 255616 in words is "two hundred fifty-five thousand, six hundred sixteen".