22001772161 has 4 divisors (see below), whose sum is σ = 22002164400. Its totient is φ = 22001379924.

The previous prime is 22001772151. The next prime is 22001772253. The reversal of 22001772161 is 16127710022.

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 22001772161 - 2⁶ = 22001772097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22001772151) 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, 94391 + ... + 230028.

It is an arithmetic number, because the mean of its divisors is an integer number (5500541100).

Almost surely, 2^22001772161 is an apocalyptic number.

It is an amenable number.

22001772161 is a deficient number, since it is larger than the sum of its proper divisors (392239).

22001772161 is an equidigital number, since it uses as much as digits as its factorization.

22001772161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392238.

The product of its (nonzero) digits is 2352, while the sum is 29.

The spelling of 22001772161 in words is "twenty-two billion, one million, seven hundred seventy-two thousand, one hundred sixty-one".