16722192217 has 4 divisors (see below), whose sum is σ = 17174143396. Its totient is φ = 16270241040.

The previous prime is 16722192209. The next prime is 16722192241. The reversal of 16722192217 is 71229122761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5966635536 + 10755556681 = 77244^2 + 103709^2 .

It is a cyclic number.

It is not a de Polignac number, because 16722192217 - 2³ = 16722192209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16722192217.

It is not an unprimeable number, because it can be changed into a prime (16722192287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225975534 + ... + 225975607.

It is an arithmetic number, because the mean of its divisors is an integer number (4293535849).

Almost surely, 2^16722192217 is an apocalyptic number.

It is an amenable number.

16722192217 is a deficient number, since it is larger than the sum of its proper divisors (451951179).

16722192217 is an equidigital number, since it uses as much as digits as its factorization.

16722192217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451951178.

The product of its digits is 42336, while the sum is 40.

It can be divided in two parts, 1672219 and 2217, that added together give a square (1674436 = 1294²).

The spelling of 16722192217 in words is "sixteen billion, seven hundred twenty-two million, one hundred ninety-two thousand, two hundred seventeen".