201664218 has 32 divisors (see below), whose sum is σ = 462458880. Its totient is φ = 57429360.

The previous prime is 201664201. The next prime is 201664219. The reversal of 201664218 is 812466102.

It is not an unprimeable number, because it can be changed into a prime (201664219) 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, 5343 + ... + 20781.

It is an arithmetic number, because the mean of its divisors is an integer number (14451840).

Almost surely, 2^201664218 is an apocalyptic number.

201664218 is an abundant number, since it is smaller than the sum of its proper divisors (260794662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201664218 is a wasteful number, since it uses less digits than its factorization.

201664218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15762.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 201664218 is about 14200.8527208756. The cubic root of 201664218 is about 586.4211368537.

The spelling of 201664218 in words is "two hundred one million, six hundred sixty-four thousand, two hundred eighteen".