22721566449 has 4 divisors (see below), whose sum is σ = 30295421936. Its totient is φ = 15147710964.

The previous prime is 22721566433. The next prime is 22721566477. The reversal of 22721566449 is 94466512722.

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 not a de Polignac number, because 22721566449 - 2⁴ = 22721566433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22721566398 and 22721566407.

It is not an unprimeable number, because it can be changed into a prime (22721566249) 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, 3786927739 + ... + 3786927744.

It is an arithmetic number, because the mean of its divisors is an integer number (7573855484).

Almost surely, 2^22721566449 is an apocalyptic number.

It is an amenable number.

22721566449 is a deficient number, since it is larger than the sum of its proper divisors (7573855487).

22721566449 is an equidigital number, since it uses as much as digits as its factorization.

22721566449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7573855486.

The product of its digits is 1451520, while the sum is 48.

The spelling of 22721566449 in words is "twenty-two billion, seven hundred twenty-one million, five hundred sixty-six thousand, four hundred forty-nine".