16209720322 has 4 divisors (see below), whose sum is σ = 24314580486. Its totient is φ = 8104860160.

The previous prime is 16209720301. The next prime is 16209720361. The reversal of 16209720322 is 22302790261.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 14040117081 + 2169603241 = 118491^2 + 46579^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4052430079 + ... + 4052430082.

Almost surely, 2^16209720322 is an apocalyptic number.

16209720322 is a deficient number, since it is larger than the sum of its proper divisors (8104860164).

16209720322 is an equidigital number, since it uses as much as digits as its factorization.

16209720322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8104860163.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 16209720322 in words is "sixteen billion, two hundred nine million, seven hundred twenty thousand, three hundred twenty-two".