16660686 has 48 divisors (see below), whose sum is σ = 39439440. Its totient is φ = 4677120.

The previous prime is 16660681. The next prime is 16660687. The reversal of 16660686 is 68606661.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17470 + ... + 18398.

It is an arithmetic number, because the mean of its divisors is an integer number (821655).

Almost surely, 2^16660686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16660686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19719720).

16660686 is an abundant number, since it is smaller than the sum of its proper divisors (22778754).

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

16660686 is a wasteful number, since it uses less digits than its factorization.

16660686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009 (or 1002 counting only the distinct ones).

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

The square root of 16660686 is about 4081.7503598334. The cubic root of 16660686 is about 255.4059202006.

The spelling of 16660686 in words is "sixteen million, six hundred sixty thousand, six hundred eighty-six".