255556609 has 16 divisors (see below), whose sum is σ = 325123200. Its totient is φ = 199132080.

The previous prime is 255556603. The next prime is 255556621. The reversal of 255556609 is 906655552.

It is not a de Polignac number, because 255556609 - 2⁵ = 255556577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255556603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30094 + ... + 37639.

It is an arithmetic number, because the mean of its divisors is an integer number (20320200).

Almost surely, 2^255556609 is an apocalyptic number.

It is an amenable number.

255556609 is a deficient number, since it is larger than the sum of its proper divisors (69566591).

255556609 is an equidigital number, since it uses as much as digits as its factorization.

255556609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67765 (or 67751 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 43.

The square root of 255556609 is about 15986.1380264278. The cubic root of 255556609 is about 634.5936259538.

The spelling of 255556609 in words is "two hundred fifty-five million, five hundred fifty-six thousand, six hundred nine".