216656622 has 96 divisors (see below), whose sum is σ = 597804480. Its totient is φ = 55157760.

The previous prime is 216656621. The next prime is 216656623. The reversal of 216656622 is 226656612.

216656622 is a `hidden beast` number, since 21 + 6 + 6 + 5 + 6 + 622 = 666.

It is an interprime number because it is at equal distance from previous prime (216656621) and next prime (216656623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216656621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45222 + ... + 49782.

It is an arithmetic number, because the mean of its divisors is an integer number (6227130).

Almost surely, 2^216656622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216656622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298902240).

216656622 is an abundant number, since it is smaller than the sum of its proper divisors (381147858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216656622 is a wasteful number, since it uses less digits than its factorization.

216656622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618 (or 4615 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 216656622 is about 14719.2602395637. The cubic root of 216656622 is about 600.6073682988.

The spelling of 216656622 in words is "two hundred sixteen million, six hundred fifty-six thousand, six hundred twenty-two".