16666649 has 8 divisors (see below), whose sum is σ = 16988160. Its totient is φ = 16348176.

The previous prime is 16666631. The next prime is 16666669. The reversal of 16666649 is 94666661.

16666649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16666649 - 2¹² = 16662553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12392 + ... + 13670.

It is an arithmetic number, because the mean of its divisors is an integer number (2123520).

Almost surely, 2^16666649 is an apocalyptic number.

It is an amenable number.

16666649 is a deficient number, since it is larger than the sum of its proper divisors (321511).

16666649 is a wasteful number, since it uses less digits than its factorization.

16666649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its digits is 279936, while the sum is 44.

The square root of 16666649 is about 4082.4807409221. The cubic root of 16666649 is about 255.4363872103.

The spelling of 16666649 in words is "sixteen million, six hundred sixty-six thousand, six hundred forty-nine".