16643311337 has 2 divisors, whose sum is σ = 16643311338. Its totient is φ = 16643311336.

The previous prime is 16643311331. The next prime is 16643311387. The reversal of 16643311337 is 73311334661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9422390761 + 7220920576 = 97069^2 + 84976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16643311337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16643311337.

It is not a weakly prime, because it can be changed into another prime (16643311331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321655668 + 8321655669.

It is an arithmetic number, because the mean of its divisors is an integer number (8321655669).

Almost surely, 2^16643311337 is an apocalyptic number.

It is an amenable number.

16643311337 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643311337 is an equidigital number, since it uses as much as digits as its factorization.

16643311337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

Adding to 16643311337 its reverse (73311334661), we get a palindrome (89954645998).

The spelling of 16643311337 in words is "sixteen billion, six hundred forty-three million, three hundred eleven thousand, three hundred thirty-seven".