16680538 has 16 divisors (see below), whose sum is σ = 28695744. Its totient is φ = 7123680.

The previous prime is 16680533. The next prime is 16680569. The reversal of 16680538 is 83508661.

It is a junction number, because it is equal to n+sod(n) for n = 16680497 and 16680506.

It is not an unprimeable number, because it can be changed into a prime (16680533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2358 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (1793484).

Almost surely, 2^16680538 is an apocalyptic number.

16680538 is a deficient number, since it is larger than the sum of its proper divisors (12015206).

16680538 is a wasteful number, since it uses less digits than its factorization.

16680538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 16680538 is about 4084.1814357347. The cubic root of 16680538 is about 255.5073227043.

The spelling of 16680538 in words is "sixteen million, six hundred eighty thousand, five hundred thirty-eight".