66321689 has 8 divisors (see below), whose sum is σ = 75846720. Its totient is φ = 56809296.

The previous prime is 66321659. The next prime is 66321707. The reversal of 66321689 is 98612366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66321689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66321659) 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, 15287 + ... + 19139.

It is an arithmetic number, because the mean of its divisors is an integer number (9480840).

Almost surely, 2^66321689 is an apocalyptic number.

It is an amenable number.

66321689 is a deficient number, since it is larger than the sum of its proper divisors (9525031).

66321689 is a wasteful number, since it uses less digits than its factorization.

66321689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319.

The product of its digits is 93312, while the sum is 41.

The square root of 66321689 is about 8143.8129276157. The cubic root of 66321689 is about 404.7795152065.

The spelling of 66321689 in words is "sixty-six million, three hundred twenty-one thousand, six hundred eighty-nine".