180556 has 6 divisors (see below), whose sum is σ = 315980. Its totient is φ = 90276.

The previous prime is 180547. The next prime is 180563. The reversal of 180556 is 655081.

It is a self number, because there is not a number n which added to its sum of digits gives 180556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22566 + ... + 22573.

2¹⁸⁰⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

180556 is a deficient number, since it is larger than the sum of its proper divisors (135424).

180556 is a wasteful number, since it uses less digits than its factorization.

180556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45143 (or 45141 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 180556 is about 424.9188157754. The cubic root of 180556 is about 56.5202370924.

The spelling of 180556 in words is "one hundred eighty thousand, five hundred fifty-six".