16722418520789 has 2 divisors, whose sum is σ = 16722418520790. Its totient is φ = 16722418520788.

The previous prime is 16722418520767. The next prime is 16722418520831. The reversal of 16722418520789 is 98702581422761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12906092175025 + 3816326345764 = 3592505^2 + 1953542^2 .

It is an emirp because it is prime and its reverse (98702581422761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16722418520789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16722418520989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361209260394 + 8361209260395.

It is an arithmetic number, because the mean of its divisors is an integer number (8361209260395).

Almost surely, 2^{16722418520789} is an apocalyptic number.

It is an amenable number.

16722418520789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16722418520789 is an equidigital number, since it uses as much as digits as its factorization.

16722418520789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27095040, while the sum is 62.

The spelling of 16722418520789 in words is "sixteen trillion, seven hundred twenty-two billion, four hundred eighteen million, five hundred twenty thousand, seven hundred eighty-nine".