16672220217 has 12 divisors (see below), whose sum is σ = 24182024724. Its totient is φ = 11068692480.

The previous prime is 16672220203. The next prime is 16672220281. The reversal of 16672220217 is 71202227661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14387762601 + 2284457616 = 119949^2 + 47796^2 .

It is not a de Polignac number, because 16672220217 - 2¹¹ = 16672218169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16672228217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3841128 + ... + 3845465.

It is an arithmetic number, because the mean of its divisors is an integer number (2015168727).

Almost surely, 2^16672220217 is an apocalyptic number.

It is an amenable number.

16672220217 is a deficient number, since it is larger than the sum of its proper divisors (7509804507).

16672220217 is a wasteful number, since it uses less digits than its factorization.

16672220217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686840 (or 7686837 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

Adding to 16672220217 its reverse (71202227661), we get a palindrome (87874447878).

The spelling of 16672220217 in words is "sixteen billion, six hundred seventy-two million, two hundred twenty thousand, two hundred seventeen".