16066891 has 4 divisors (see below), whose sum is σ = 16260552. Its totient is φ = 15873232.

The previous prime is 16066889. The next prime is 16066901. The reversal of 16066891 is 19866061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19866061 = 541 ⋅36721.

It is a cyclic number.

It is not a de Polignac number, because 16066891 - 2¹ = 16066889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16066891.

It is not an unprimeable number, because it can be changed into a prime (16066291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96706 + ... + 96871.

It is an arithmetic number, because the mean of its divisors is an integer number (4065138).

Almost surely, 2^16066891 is an apocalyptic number.

16066891 is a deficient number, since it is larger than the sum of its proper divisors (193661).

16066891 is an equidigital number, since it uses as much as digits as its factorization.

16066891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193660.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16066891 is about 4008.3526541461. The cubic root of 16066891 is about 252.3348775005.

The spelling of 16066891 in words is "sixteen million, sixty-six thousand, eight hundred ninety-one".