220717666418 has 6 divisors (see below), whose sum is σ = 331077496239. Its totient is φ = 110358501006.

The previous prime is 220717666381. The next prime is 220717666439. The reversal of 220717666418 is 814666717022.

It can be written as a sum of positive squares in only one way, i.e., 110358833209 + 110358833209 = 332203^2 + 332203^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332203.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 498305 + ... + 830507.

Almost surely, 2^220717666418 is an apocalyptic number.

220717666418 is a deficient number, since it is larger than the sum of its proper divisors (110359829821).

220717666418 is an frugal number, since it uses more digits than its factorization.

220717666418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664408 (or 332205 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

Multiplying 220717666418 by its sum of digits (50), we get a square (11035883320900 = 3322030²).

The spelling of 220717666418 in words is "two hundred twenty billion, seven hundred seventeen million, six hundred sixty-six thousand, four hundred eighteen".