16697012809 has 2 divisors, whose sum is σ = 16697012810. Its totient is φ = 16697012808.

The previous prime is 16697012747. The next prime is 16697012821. The reversal of 16697012809 is 90821079661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9989402809 + 6707610000 = 99947^2 + 81900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16697012809 is a prime.

It is not a weakly prime, because it can be changed into another prime (16697012879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8348506404 + 8348506405.

It is an arithmetic number, because the mean of its divisors is an integer number (8348506405).

Almost surely, 2^16697012809 is an apocalyptic number.

It is an amenable number.

16697012809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16697012809 is an equidigital number, since it uses as much as digits as its factorization.

16697012809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 16697012809 in words is "sixteen billion, six hundred ninety-seven million, twelve thousand, eight hundred nine".