66864667 has 8 divisors (see below), whose sum is σ = 70479360. Its totient is φ = 63259560.

The previous prime is 66864647. The next prime is 66864683. The reversal of 66864667 is 76646866.

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 66864667 - 2¹¹ = 66862619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66864667.

It is not an unprimeable number, because it can be changed into a prime (66864607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15378 + ... + 19240.

It is an arithmetic number, because the mean of its divisors is an integer number (8809920).

Almost surely, 2^66864667 is an apocalyptic number.

66864667 is a deficient number, since it is larger than the sum of its proper divisors (3614693).

66864667 is a wasteful number, since it uses less digits than its factorization.

66864667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4793.

The product of its digits is 1741824, while the sum is 49.

The square root of 66864667 is about 8177.0818144372. The cubic root of 66864667 is about 405.8811622878.

The spelling of 66864667 in words is "sixty-six million, eight hundred sixty-four thousand, six hundred sixty-seven".