16442731566109 has 2 divisors, whose sum is σ = 16442731566110. Its totient is φ = 16442731566108.

The previous prime is 16442731566061. The next prime is 16442731566179. The reversal of 16442731566109 is 90166513724461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11736448222500 + 4706283343609 = 3425850^2 + 2169397^2 .

It is an emirp because it is prime and its reverse (90166513724461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16442731566109 is a prime.

It is a super-3 number, since 3×16442731566109³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16442731566109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16442731566179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221365783054 + 8221365783055.

It is an arithmetic number, because the mean of its divisors is an integer number (8221365783055).

Almost surely, 2^{16442731566109} is an apocalyptic number.

It is an amenable number.

16442731566109 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442731566109 is an equidigital number, since it uses as much as digits as its factorization.

16442731566109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 16442731566109 in words is "sixteen trillion, four hundred forty-two billion, seven hundred thirty-one million, five hundred sixty-six thousand, one hundred nine".