16666680 has 32 divisors (see below), whose sum is σ = 50000400. Its totient is φ = 4444416.

The previous prime is 16666669. The next prime is 16666711. The reversal of 16666680 is 8666661.

16666680 = T₁₉₂₀ + T₁₉₂₁ + ... + T₁₉₂₈.

16666680 is nontrivially palindromic in base 9.

16666680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69325 + ... + 69564.

Almost surely, 2^16666680 is an apocalyptic number.

16666680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16666680 is an abundant number, since it is smaller than the sum of its proper divisors (33333720).

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

16666680 is a wasteful number, since it uses less digits than its factorization.

16666680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138903 (or 138899 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 16666680 is about 4082.4845376315. The cubic root of 16666680 is about 255.4365455809.

The spelling of 16666680 in words is "sixteen million, six hundred sixty-six thousand, six hundred eighty".