22775191991 has 4 divisors (see below), whose sum is σ = 23259770592. Its totient is φ = 22290613392.

The previous prime is 22775191931. The next prime is 22775191993. The reversal of 22775191991 is 19919157722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19919157722 = 2 ⋅9959578861.

It is a cyclic number.

It is not a de Polignac number, because 22775191991 - 2¹⁰ = 22775190967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22775191993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242289230 + ... + 242289323.

It is an arithmetic number, because the mean of its divisors is an integer number (5814942648).

Almost surely, 2^22775191991 is an apocalyptic number.

22775191991 is a deficient number, since it is larger than the sum of its proper divisors (484578601).

22775191991 is an equidigital number, since it uses as much as digits as its factorization.

22775191991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484578600.

The product of its digits is 714420, while the sum is 53.

The spelling of 22775191991 in words is "twenty-two billion, seven hundred seventy-five million, one hundred ninety-one thousand, nine hundred ninety-one".