220664161 has 8 divisors (see below), whose sum is σ = 228813480. Its totient is φ = 212550912.

The previous prime is 220664153. The next prime is 220664167. The reversal of 220664161 is 161466022.

It can be written as a sum of positive squares in 4 ways, for example, as 17430625 + 203233536 = 4175^2 + 14256^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220664161 - 2³ = 220664153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220664167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3771 + ... + 21343.

It is an arithmetic number, because the mean of its divisors is an integer number (28601685).

Almost surely, 2^220664161 is an apocalyptic number.

It is an amenable number.

220664161 is a deficient number, since it is larger than the sum of its proper divisors (8149319).

220664161 is a wasteful number, since it uses less digits than its factorization.

220664161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18035.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 220664161 is about 14854.7689648813. The cubic root of 220664161 is about 604.2879503945.

The spelling of 220664161 in words is "two hundred twenty million, six hundred sixty-four thousand, one hundred sixty-one".