66086666 has 8 divisors (see below), whose sum is σ = 99215364. Its totient is φ = 33014880.

The previous prime is 66086651. The next prime is 66086687. The reversal of 66086666 is 66668066.

It is a happy number.

66086666 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 2 ways, for example, as 65691025 + 395641 = 8105^2 + 629^2 .

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

66086666 is a modest number, since divided by 6666 gives 6608 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11195 + ... + 16046.

Almost surely, 2^66086666 is an apocalyptic number.

66086666 is a deficient number, since it is larger than the sum of its proper divisors (33128698).

66086666 is a wasteful number, since it uses less digits than its factorization.

66086666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28456.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 66086666 is about 8129.3705783412. The cubic root of 66086666 is about 404.3008126267.

The spelling of 66086666 in words is "sixty-six million, eighty-six thousand, six hundred sixty-six".