16691613161 has 2 divisors, whose sum is σ = 16691613162. Its totient is φ = 16691613160.

The previous prime is 16691613157. The next prime is 16691613203. The reversal of 16691613161 is 16131619661.

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., 14897667136 + 1793946025 = 122056^2 + 42355^2 .

It is an emirp because it is prime and its reverse (16131619661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16691613161 - 2² = 16691613157 is a prime.

It is not a weakly prime, because it can be changed into another prime (16691613461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345806580 + 8345806581.

It is an arithmetic number, because the mean of its divisors is an integer number (8345806581).

Almost surely, 2^16691613161 is an apocalyptic number.

It is an amenable number.

16691613161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16691613161 is an equidigital number, since it uses as much as digits as its factorization.

16691613161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 41.

The spelling of 16691613161 in words is "sixteen billion, six hundred ninety-one million, six hundred thirteen thousand, one hundred sixty-one".