22156666444 has 12 divisors (see below), whose sum is σ = 42299090568. Its totient is φ = 10071212000.

The previous prime is 22156666409. The next prime is 22156666453. The reversal of 22156666444 is 44466665122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22156666394 and 22156666403.

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, 251780257 + ... + 251780344.

It is an arithmetic number, because the mean of its divisors is an integer number (3524924214).

Almost surely, 2^22156666444 is an apocalyptic number.

It is an amenable number.

22156666444 is a deficient number, since it is larger than the sum of its proper divisors (20142424124).

22156666444 is a wasteful number, since it uses less digits than its factorization.

22156666444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503560616 (or 503560614 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

It can be divided in two parts, 221 and 56666444, that added together give a palindrome (56666665).

The spelling of 22156666444 in words is "twenty-two billion, one hundred fifty-six million, six hundred sixty-six thousand, four hundred forty-four".