66666849 has 8 divisors (see below), whose sum is σ = 88938240. Its totient is φ = 44420016.

The previous prime is 66666841. The next prime is 66666851. The reversal of 66666849 is 94866666.

66666849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66666849 - 2³ = 66666841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66666841) 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 7 ways as a sum of consecutive naturals, for example, 1587 + ... + 11655.

It is an arithmetic number, because the mean of its divisors is an integer number (11117280).

Almost surely, 2^66666849 is an apocalyptic number.

It is an amenable number.

66666849 is a deficient number, since it is larger than the sum of its proper divisors (22271391).

66666849 is a wasteful number, since it uses less digits than its factorization.

66666849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12279.

The product of its digits is 2239488, while the sum is 51.

The square root of 66666849 is about 8164.9769748604. The cubic root of 66666849 is about 405.4805027006.

The spelling of 66666849 in words is "sixty-six million, six hundred sixty-six thousand, eight hundred forty-nine".