22721643169 has 9 divisors (see below), whose sum is σ = 22842418161. Its totient is φ = 22601505780.

The previous prime is 22721643163. The next prime is 22721643209. The reversal of 22721643169 is 96134612722.

The square root of 22721643169 is 150737.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 22721643169 - 2⁷ = 22721643041 is a prime.

It is a super-2 number, since 2×22721643169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22721643163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46276014 + ... + 46276504.

Almost surely, 2^22721643169 is an apocalyptic number.

22721643169 is the 150737-th square number.

22721643169 is the 75369-th centered octagonal number.

It is an amenable number.

22721643169 is a deficient number, since it is larger than the sum of its proper divisors (120774992).

22721643169 is an frugal number, since it uses more digits than its factorization.

22721643169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 798 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The spelling of 22721643169 in words is "twenty-two billion, seven hundred twenty-one million, six hundred forty-three thousand, one hundred sixty-nine".