220946661 has 24 divisors (see below), whose sum is σ = 344591520. Its totient is φ = 135612576.

The previous prime is 220946659. The next prime is 220946669. The reversal of 220946661 is 166649022.

220946661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220946661 - 2¹ = 220946659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220946669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46770 + ... + 51276.

It is an arithmetic number, because the mean of its divisors is an integer number (14357980).

Almost surely, 2^220946661 is an apocalyptic number.

It is an amenable number.

220946661 is a deficient number, since it is larger than the sum of its proper divisors (123644859).

220946661 is a wasteful number, since it uses less digits than its factorization.

220946661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4945 (or 4942 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 220946661 is about 14864.2746543516. The cubic root of 220946661 is about 604.5457154786.

The spelling of 220946661 in words is "two hundred twenty million, nine hundred forty-six thousand, six hundred sixty-one".