16661724 has 12 divisors (see below), whose sum is σ = 38877384. Its totient is φ = 5553904.

The previous prime is 16661713. The next prime is 16661741. The reversal of 16661724 is 42716661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×16661724² = 555226093304352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694227 + ... + 694250.

It is an arithmetic number, because the mean of its divisors is an integer number (3239782).

Almost surely, 2^16661724 is an apocalyptic number.

It is an amenable number.

16661724 is an abundant number, since it is smaller than the sum of its proper divisors (22215660).

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

16661724 is a wasteful number, since it uses less digits than its factorization.

16661724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388484 (or 1388482 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 16661724 is about 4081.8775091862. The cubic root of 16661724 is about 255.4112242207.

The spelling of 16661724 in words is "sixteen million, six hundred sixty-one thousand, seven hundred twenty-four".