16666560 has 140 divisors (see below), whose sum is σ = 59378088. Its totient is φ = 4437504.

The previous prime is 16666549. The next prime is 16666577. The reversal of 16666560 is 6566661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25599 + ... + 26241.

Almost surely, 2^16666560 is an apocalyptic number.

16666560 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 16666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29689044).

16666560 is an abundant number, since it is smaller than the sum of its proper divisors (42711528).

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

16666560 is an equidigital number, since it uses as much as digits as its factorization.

16666560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 16666560 is about 4082.4698406724. The cubic root of 16666560 is about 255.4359325322.

The spelling of 16666560 in words is "sixteen million, six hundred sixty-six thousand, five hundred sixty".