16698166891 has 16 divisors (see below), whose sum is σ = 20105049600. Its totient is φ = 13547919168.

The previous prime is 16698166847. The next prime is 16698166939. The reversal of 16698166891 is 19866189661.

It is not a de Polignac number, because 16698166891 - 2⁷ = 16698166763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16698166091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106050 + ... + 211288.

It is an arithmetic number, because the mean of its divisors is an integer number (1256565600).

Almost surely, 2^16698166891 is an apocalyptic number.

16698166891 is a deficient number, since it is larger than the sum of its proper divisors (3406882709).

16698166891 is a wasteful number, since it uses less digits than its factorization.

16698166891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106458.

The product of its digits is 6718464, while the sum is 61.

The spelling of 16698166891 in words is "sixteen billion, six hundred ninety-eight million, one hundred sixty-six thousand, eight hundred ninety-one".