73221663443 has 4 divisors (see below), whose sum is σ = 73222253208. Its totient is φ = 73221073680.

The previous prime is 73221663413. The next prime is 73221663457. The reversal of 73221663443 is 34436612237.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34436612237 = 97 ⋅355016621.

It is a cyclic number.

It is not a de Polignac number, because 73221663443 - 2¹² = 73221659347 is a prime.

It is a super-2 number, since 2×73221663443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73221663443.

It is not an unprimeable number, because it can be changed into a prime (73221663413) 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, 28346 + ... + 383727.

It is an arithmetic number, because the mean of its divisors is an integer number (18305563302).

Almost surely, 2^73221663443 is an apocalyptic number.

73221663443 is a deficient number, since it is larger than the sum of its proper divisors (589765).

73221663443 is a wasteful number, since it uses less digits than its factorization.

73221663443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589764.

The product of its digits is 435456, while the sum is 41.

The spelling of 73221663443 in words is "seventy-three billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-three".