16666642 has 8 divisors (see below), whose sum is σ = 25023600. Its totient is φ = 8325444.

The previous prime is 16666631. The next prime is 16666669. The reversal of 16666642 is 24666661.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792 + ... + 5827.

It is an arithmetic number, because the mean of its divisors is an integer number (3127950).

Almost surely, 2^16666642 is an apocalyptic number.

16666642 is a deficient number, since it is larger than the sum of its proper divisors (8356958).

16666642 is a wasteful number, since it uses less digits than its factorization.

16666642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7880.

The product of its digits is 62208, while the sum is 37.

The square root of 16666642 is about 4082.4798836002. The cubic root of 16666642 is about 255.4363514491.

The spelling of 16666642 in words is "sixteen million, six hundred sixty-six thousand, six hundred forty-two".