216646622 has 4 divisors (see below), whose sum is σ = 324969936. Its totient is φ = 108323310.

The previous prime is 216646609. The next prime is 216646649. The reversal of 216646622 is 226646612.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 54161654 + ... + 54161657.

It is an arithmetic number, because the mean of its divisors is an integer number (81242484).

Almost surely, 2^216646622 is an apocalyptic number.

216646622 is a deficient number, since it is larger than the sum of its proper divisors (108323314).

216646622 is a wasteful number, since it uses less digits than its factorization.

216646622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108323313.

The product of its digits is 41472, while the sum is 35.

The square root of 216646622 is about 14718.9205446595. The cubic root of 216646622 is about 600.5981276149.

The spelling of 216646622 in words is "two hundred sixteen million, six hundred forty-six thousand, six hundred twenty-two".