16684166851 has 16 divisors (see below), whose sum is σ = 18682462080. Its totient is φ = 14770938880.

The previous prime is 16684166839. The next prime is 16684166879. The reversal of 16684166851 is 15866148661.

It is a cyclic number.

It is not a de Polignac number, because 16684166851 - 2⁵ = 16684166819 is a prime.

It is a super-2 number, since 2×16684166851² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16684166881) 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, 50686 + ... + 189571.

It is an arithmetic number, because the mean of its divisors is an integer number (1167653880).

Almost surely, 2^16684166851 is an apocalyptic number.

16684166851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16684166851 is a deficient number, since it is larger than the sum of its proper divisors (1998295229).

16684166851 is a wasteful number, since it uses less digits than its factorization.

16684166851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240434.

The product of its digits is 1658880, while the sum is 52.

The spelling of 16684166851 in words is "sixteen billion, six hundred eighty-four million, one hundred sixty-six thousand, eight hundred fifty-one".