16666818 has 32 divisors (see below), whose sum is σ = 38482560. Its totient is φ = 4713600.

The previous prime is 16666807. The next prime is 16666823. The reversal of 16666818 is 81866661.

16666818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666818.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2278 + ... + 6206.

It is an arithmetic number, because the mean of its divisors is an integer number (1202580).

Almost surely, 2^16666818 is an apocalyptic number.

16666818 is an abundant number, since it is smaller than the sum of its proper divisors (21815742).

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

16666818 is a wasteful number, since it uses less digits than its factorization.

16666818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042.

The product of its digits is 82944, while the sum is 42.

The square root of 16666818 is about 4082.5014390689. The cubic root of 16666818 is about 255.4372505832.

The spelling of 16666818 in words is "sixteen million, six hundred sixty-six thousand, eight hundred eighteen".