16646660 has 48 divisors (see below), whose sum is σ = 37376640. Its totient is φ = 6209280.

The previous prime is 16646657. The next prime is 16646671. The reversal of 16646660 is 6664661.

It is a super-2 number, since 2×16646660² = 554222578311200, 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 16646660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26672 + ... + 27288.

It is an arithmetic number, because the mean of its divisors is an integer number (778680).

Almost surely, 2^16646660 is an apocalyptic number.

16646660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16646660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18688320).

16646660 is an abundant number, since it is smaller than the sum of its proper divisors (20729980).

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

16646660 is a wasteful number, since it uses less digits than its factorization.

16646660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 16646660 is about 4080.0318626207. The cubic root of 16646660 is about 255.3342278910.

The spelling of 16646660 in words is "sixteen million, six hundred forty-six thousand, six hundred sixty".