66666445 has 8 divisors (see below), whose sum is σ = 81702144. Its totient is φ = 52198224.

The previous prime is 66666437. The next prime is 66666487. The reversal of 66666445 is 54466666.

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 66666445 - 2³ = 66666437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141609 + ... + 142078.

It is an arithmetic number, because the mean of its divisors is an integer number (10212768).

Almost surely, 2^66666445 is an apocalyptic number.

It is an amenable number.

66666445 is a deficient number, since it is larger than the sum of its proper divisors (15035699).

66666445 is a wasteful number, since it uses less digits than its factorization.

66666445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283739.

The product of its digits is 622080, while the sum is 43.

The square root of 66666445 is about 8164.9522350103. The cubic root of 66666445 is about 405.4796836306.

The spelling of 66666445 in words is "sixty-six million, six hundred sixty-six thousand, four hundred forty-five".