2065664218 has 8 divisors (see below), whose sum is σ = 3099661812. Its totient is φ = 1032443616.

The previous prime is 2065664191. The next prime is 2065664219. The reversal of 2065664218 is 8124665602.

It can be written as a sum of positive squares in 2 ways, for example, as 1516089969 + 549574249 = 38937^2 + 23443^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2065664219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187555 + ... + 198262.

Almost surely, 2^2065664218 is an apocalyptic number.

2065664218 is a deficient number, since it is larger than the sum of its proper divisors (1033997594).

2065664218 is a wasteful number, since it uses less digits than its factorization.

2065664218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388496.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 2065664218 is about 45449.5788539344. The cubic root of 2065664218 is about 1273.5614621157.

The spelling of 2065664218 in words is "two billion, sixty-five million, six hundred sixty-four thousand, two hundred eighteen".