220664018 has 4 divisors (see below), whose sum is σ = 330996030. Its totient is φ = 110332008.

The previous prime is 220663999. The next prime is 220664053. The reversal of 220664018 is 810466022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810466022 = 2 ⋅405233011.

It can be written as a sum of positive squares in only one way, i.e., 155426089 + 65237929 = 12467^2 + 8077^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55166003 + ... + 55166006.

Almost surely, 2^220664018 is an apocalyptic number.

220664018 is a deficient number, since it is larger than the sum of its proper divisors (110332012).

220664018 is a wasteful number, since it uses less digits than its factorization.

220664018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110332011.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 220664018 is about 14854.7641516114. The cubic root of 220664018 is about 604.2878198595.

The spelling of 220664018 in words is "two hundred twenty million, six hundred sixty-four thousand, eighteen".