255556646 has 8 divisors (see below), whose sum is σ = 384434400. Its totient is φ = 127411848.

The previous prime is 255556627. The next prime is 255556667. The reversal of 255556646 is 646655552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 255556597 and 255556606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182366 + ... + 183761.

It is an arithmetic number, because the mean of its divisors is an integer number (48054300).

Almost surely, 2^255556646 is an apocalyptic number.

255556646 is a deficient number, since it is larger than the sum of its proper divisors (128877754).

255556646 is a wasteful number, since it uses less digits than its factorization.

255556646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366478.

The product of its digits is 1080000, while the sum is 44.

The square root of 255556646 is about 15986.1391836803. The cubic root of 255556646 is about 634.5936565797.

The spelling of 255556646 in words is "two hundred fifty-five million, five hundred fifty-six thousand, six hundred forty-six".