22156566568 has 8 divisors (see below), whose sum is σ = 41543562330. Its totient is φ = 11078283280.

The previous prime is 22156566511. The next prime is 22156566581. The reversal of 22156566568 is 86566565122.

It can be written as a sum of positive squares in only one way, i.e., 18284989284 + 3871577284 = 135222^2 + 62222^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1384785403 + ... + 1384785418.

Almost surely, 2^22156566568 is an apocalyptic number.

It is an amenable number.

22156566568 is a deficient number, since it is larger than the sum of its proper divisors (19386995762).

22156566568 is a wasteful number, since it uses less digits than its factorization.

22156566568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2769570827 (or 2769570823 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 52.

The spelling of 22156566568 in words is "twenty-two billion, one hundred fifty-six million, five hundred sixty-six thousand, five hundred sixty-eight".