22222165621556 has 12 divisors (see below), whose sum is σ = 38888845779168. Its totient is φ = 11111066827512.

The previous prime is 22222165621531. The next prime is 22222165621571. The reversal of 22222165621556 is 65512656122222.

It is a super-2 number, since 2×22222165621556² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22222165621556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534386 + ... + 6688041.

It is an arithmetic number, because the mean of its divisors is an integer number (3240737148264).

Almost surely, 2^{22222165621556} is an apocalyptic number.

It is an amenable number.

22222165621556 is a deficient number, since it is larger than the sum of its proper divisors (16666680157612).

22222165621556 is a wasteful number, since it uses less digits than its factorization.

22222165621556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7991638 (or 7991636 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 47.

The spelling of 22222165621556 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred sixty-five million, six hundred twenty-one thousand, five hundred fifty-six".