16666224 has 40 divisors (see below), whose sum is σ = 43485312. Its totient is φ = 5499840.

The previous prime is 16666219. The next prime is 16666231. The reversal of 16666224 is 42266661.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3259 + ... + 6629.

Almost surely, 2^16666224 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 16666224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21742656).

16666224 is an abundant number, since it is smaller than the sum of its proper divisors (26819088).

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

16666224 is a wasteful number, since it uses less digits than its factorization.

16666224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485 (or 3479 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 16666224 is about 4082.4286889057. The cubic root of 16666224 is about 255.4342159802.

The spelling of 16666224 in words is "sixteen million, six hundred sixty-six thousand, two hundred twenty-four".