16680642 has 16 divisors (see below), whose sum is σ = 36394272. Its totient is φ = 5054720.

The previous prime is 16680619. The next prime is 16680649. The reversal of 16680642 is 24608661.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (16680649) 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 7 ways as a sum of consecutive naturals, for example, 126303 + ... + 126434.

It is an arithmetic number, because the mean of its divisors is an integer number (2274642).

Almost surely, 2^16680642 is an apocalyptic number.

16680642 is an abundant number, since it is smaller than the sum of its proper divisors (19713630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16680642 is a wasteful number, since it uses less digits than its factorization.

16680642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252753.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 16680642 is about 4084.1941677643. The cubic root of 16680642 is about 255.5078537165.

It can be divided in two parts, 166 and 80642, that added together give a palindrome (80808).

The spelling of 16680642 in words is "sixteen million, six hundred eighty thousand, six hundred forty-two".