16681606 has 4 divisors (see below), whose sum is σ = 25022412. Its totient is φ = 8340802.

The previous prime is 16681597. The next prime is 16681633. The reversal of 16681606 is 60618661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60618661 = 983 ⋅61667.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4170400 + ... + 4170403.

It is an arithmetic number, because the mean of its divisors is an integer number (6255603).

Almost surely, 2^16681606 is an apocalyptic number.

16681606 is a deficient number, since it is larger than the sum of its proper divisors (8340806).

16681606 is an equidigital number, since it uses as much as digits as its factorization.

16681606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340805.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 16681606 is about 4084.3121819959. The cubic root of 16681606 is about 255.5127756858.

The spelling of 16681606 in words is "sixteen million, six hundred eighty-one thousand, six hundred six".