16680511 has 8 divisors (see below), whose sum is σ = 17502848. Its totient is φ = 15876000.

The previous prime is 16680509. The next prime is 16680523. The reversal of 16680511 is 11508661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(16680511) divides (16680511-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 16680511 - 2¹ = 16680509 is a prime.

It is a super-2 number, since 2×16680511² = 556478894442242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16680511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16680571) 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, 2520 + ... + 6301.

It is an arithmetic number, because the mean of its divisors is an integer number (2187856).

Almost surely, 2^16680511 is an apocalyptic number.

16680511 is the 1827-th centered decagonal number.

16680511 is a deficient number, since it is larger than the sum of its proper divisors (822337).

16680511 is an equidigital number, since it uses as much as digits as its factorization.

16680511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8913.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 16680511 is about 4084.1781302975. The cubic root of 16680511 is about 255.5071848450.

The spelling of 16680511 in words is "sixteen million, six hundred eighty thousand, five hundred eleven".