220888661 has 16 divisors (see below), whose sum is σ = 269107200. Its totient is φ = 177089328.

The previous prime is 220888651. The next prime is 220888669. The reversal of 220888661 is 166888022.

It is a cyclic number.

It is not a de Polignac number, because 220888661 - 2²⁶ = 153779797 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220888669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5 + ... + 21018.

It is an arithmetic number, because the mean of its divisors is an integer number (16819200).

Almost surely, 2^220888661 is an apocalyptic number.

It is an amenable number.

220888661 is a deficient number, since it is larger than the sum of its proper divisors (48218539).

220888661 is a wasteful number, since it uses less digits than its factorization.

220888661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21128.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 220888661 is about 14862.3235397430. The cubic root of 220888661 is about 604.4928117296.

The spelling of 220888661 in words is "two hundred twenty million, eight hundred eighty-eight thousand, six hundred sixty-one".