22019778161 has 4 divisors (see below), whose sum is σ = 22392994800. Its totient is φ = 21646561524.

The previous prime is 22019778149. The next prime is 22019778163. The reversal of 22019778161 is 16187791022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22019778161 - 2²² = 22015583857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22019778163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186608231 + ... + 186608348.

It is an arithmetic number, because the mean of its divisors is an integer number (5598248700).

Almost surely, 2^22019778161 is an apocalyptic number.

It is an amenable number.

22019778161 is a deficient number, since it is larger than the sum of its proper divisors (373216639).

22019778161 is an equidigital number, since it uses as much as digits as its factorization.

22019778161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373216638.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 22019778161 in words is "twenty-two billion, nineteen million, seven hundred seventy-eight thousand, one hundred sixty-one".