216622556 has 12 divisors (see below), whose sum is σ = 395571792. Its totient is φ = 103602048.

The previous prime is 216622499. The next prime is 216622583. The reversal of 216622556 is 655226612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177205 + ... + 1177388.

It is an arithmetic number, because the mean of its divisors is an integer number (32964316).

Almost surely, 2^216622556 is an apocalyptic number.

It is an amenable number.

216622556 is a deficient number, since it is larger than the sum of its proper divisors (178949236).

216622556 is a wasteful number, since it uses less digits than its factorization.

216622556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354620 (or 2354618 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 216622556 is about 14718.1030027650. The cubic root of 216622556 is about 600.5758878193.

The spelling of 216622556 in words is "two hundred sixteen million, six hundred twenty-two thousand, five hundred fifty-six".