66666886 has 24 divisors (see below), whose sum is σ = 118378512. Its totient is φ = 27970800.

The previous prime is 66666881. The next prime is 66666913. The reversal of 66666886 is 68866666.

66666886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666881) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7450 + ... + 13741.

It is an arithmetic number, because the mean of its divisors is an integer number (4932438).

Almost surely, 2^66666886 is an apocalyptic number.

66666886 is a deficient number, since it is larger than the sum of its proper divisors (51711626).

66666886 is a wasteful number, since it uses less digits than its factorization.

66666886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21228 (or 21217 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 52.

The square root of 66666886 is about 8164.9792406350. The cubic root of 66666886 is about 405.4805777143.

The spelling of 66666886 in words is "sixty-six million, six hundred sixty-six thousand, eight hundred eighty-six".