16616622116609 has 2 divisors, whose sum is σ = 16616622116610. Its totient is φ = 16616622116608.

The previous prime is 16616622116581. The next prime is 16616622116621. The reversal of 16616622116609 is 90661122661661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16595463505009 + 21158611600 = 4073753^2 + 145460^2 .

It is an emirp because it is prime and its reverse (90661122661661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16616622116609 is a prime.

It is a super-2 number, since 2×16616622116609² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16616622116639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8308311058304 + 8308311058305.

It is an arithmetic number, because the mean of its divisors is an integer number (8308311058305).

Almost surely, 2^{16616622116609} is an apocalyptic number.

It is an amenable number.

16616622116609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16616622116609 is an equidigital number, since it uses as much as digits as its factorization.

16616622116609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 16616622116609 in words is "sixteen trillion, six hundred sixteen billion, six hundred twenty-two million, one hundred sixteen thousand, six hundred nine".