16661736 has 96 divisors (see below), whose sum is σ = 55560960. Its totient is φ = 4392576.

The previous prime is 16661713. The next prime is 16661741. The reversal of 16661736 is 63716661.

It is a super-2 number, since 2×16661736² = 555226893067392, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 16661736.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5281 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (578760).

Almost surely, 2^16661736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16661736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27780480).

16661736 is an abundant number, since it is smaller than the sum of its proper divisors (38899224).

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

16661736 is a wasteful number, since it uses less digits than its factorization.

16661736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575 (or 2568 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 16661736 is about 4081.8789790977. The cubic root of 16661736 is about 255.4112855376.

The spelling of 16661736 in words is "sixteen million, six hundred sixty-one thousand, seven hundred thirty-six".