16680516 has 12 divisors (see below), whose sum is σ = 38921232. Its totient is φ = 5560168.

The previous prime is 16680509. The next prime is 16680523. The reversal of 16680516 is 61508661.

16680516 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16680509) and next prime (16680523).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×16680516² = 556479228052512, which contains 22 as substring.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695010 + ... + 695033.

It is an arithmetic number, because the mean of its divisors is an integer number (3243436).

Almost surely, 2^16680516 is an apocalyptic number.

It is an amenable number.

16680516 is an abundant number, since it is smaller than the sum of its proper divisors (22240716).

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

16680516 is a wasteful number, since it uses less digits than its factorization.

16680516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390050 (or 1390048 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 16680516 is about 4084.1787424157. The cubic root of 16680516 is about 255.5072103745.

The spelling of 16680516 in words is "sixteen million, six hundred eighty thousand, five hundred sixteen".