163066221 has 6 divisors (see below), whose sum is σ = 235540110. Its totient is φ = 108710808.

The previous prime is 163066219. The next prime is 163066229. The reversal of 163066221 is 122660361.

163066221 is a `hidden beast` number, since 1 + 6 + 30 + 6 + 622 + 1 = 666.

163066221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 115992900 + 47073321 = 10770^2 + 6861^2 .

It is not a de Polignac number, because 163066221 - 2¹ = 163066219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163066229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9059226 + ... + 9059243.

It is an arithmetic number, because the mean of its divisors is an integer number (39256685).

Almost surely, 2^163066221 is an apocalyptic number.

It is an amenable number.

163066221 is a deficient number, since it is larger than the sum of its proper divisors (72473889).

163066221 is a wasteful number, since it uses less digits than its factorization.

163066221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18118475 (or 18118472 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 163066221 is about 12769.7384859675. The cubic root of 163066221 is about 546.3295217328.

The spelling of 163066221 in words is "one hundred sixty-three million, sixty-six thousand, two hundred twenty-one".