22222222166728 has 16 divisors (see below), whose sum is σ = 41882556029580. Its totient is φ = 11053540558848.

The previous prime is 22222222166717. The next prime is 22222222166743. The reversal of 22222222166728 is 82766122222222.

It can be written as a sum of positive squares in 2 ways, for example, as 19334119055364 + 2888103111364 = 4397058^2 + 1699442^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7196313925 + ... + 7196317012.

Almost surely, 2^{22222222166728} is an apocalyptic number.

It is an amenable number.

22222222166728 is a deficient number, since it is larger than the sum of its proper divisors (19660333862852).

22222222166728 is a wasteful number, since it uses less digits than its factorization.

22222222166728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14392631136 (or 14392631132 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 46.

The spelling of 22222222166728 in words is "twenty-two trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred sixty-six thousand, seven hundred twenty-eight".