16749666 has 20 divisors (see below), whose sum is σ = 37532022. Its totient is φ = 5583168.

The previous prime is 16749647. The next prime is 16749679. The reversal of 16749666 is 66694761.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15046641 + 1703025 = 3879^2 + 1305^2 .

It is a super-2 number, since 2×16749666² = 561102622223112, 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 9 ways as a sum of consecutive naturals, for example, 51535 + ... + 51858.

Almost surely, 2^16749666 is an apocalyptic number.

16749666 is an abundant number, since it is smaller than the sum of its proper divisors (20782356).

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

16749666 is a wasteful number, since it uses less digits than its factorization.

16749666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103407 (or 103398 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 16749666 is about 4092.6355811384. The cubic root of 16749666 is about 255.8597966828.

The spelling of 16749666 in words is "sixteen million, seven hundred forty-nine thousand, six hundred sixty-six".