22108161778 has 32 divisors (see below), whose sum is σ = 36040919040. Its totient is φ = 10136327040.

The previous prime is 22108161743. The next prime is 22108161793. The reversal of 22108161778 is 87716180122.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142000 + ... + 253732.

It is an arithmetic number, because the mean of its divisors is an integer number (1126278720).

Almost surely, 2^22108161778 is an apocalyptic number.

22108161778 is a deficient number, since it is larger than the sum of its proper divisors (13932757262).

22108161778 is a wasteful number, since it uses less digits than its factorization.

22108161778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111922.

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 22108161778 in words is "twenty-two billion, one hundred eight million, one hundred sixty-one thousand, seven hundred seventy-eight".