16666645 has 16 divisors (see below), whose sum is σ = 20599920. Its totient is φ = 12939264.

The previous prime is 16666631. The next prime is 16666669. The reversal of 16666645 is 54666661.

16666645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3771364 + 12895281 = 1942^2 + 3591^2 .

It is a cyclic number.

It is not a de Polignac number, because 16666645 - 2²³ = 8278037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16666598 and 16666607.

It is a congruent number.

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, 28597 + ... + 29173.

It is an arithmetic number, because the mean of its divisors is an integer number (1287495).

Almost surely, 2^16666645 is an apocalyptic number.

It is an amenable number.

16666645 is a deficient number, since it is larger than the sum of its proper divisors (3933275).

16666645 is a wasteful number, since it uses less digits than its factorization.

16666645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its digits is 155520, while the sum is 40.

The square root of 16666645 is about 4082.4802510239. The cubic root of 16666645 is about 255.4363667753.

The spelling of 16666645 in words is "sixteen million, six hundred sixty-six thousand, six hundred forty-five".