66389659 has 12 divisors (see below), whose sum is σ = 77565600. Its totient is φ = 56657328.

The previous prime is 66389651. The next prime is 66389669. The reversal of 66389659 is 95698366.

It is a happy number.

It is not a de Polignac number, because 66389659 - 2³ = 66389651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66389651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8877 + ... + 14545.

It is an arithmetic number, because the mean of its divisors is an integer number (6463800).

Almost surely, 2^66389659 is an apocalyptic number.

66389659 is a deficient number, since it is larger than the sum of its proper divisors (11175941).

66389659 is a wasteful number, since it uses less digits than its factorization.

66389659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922 (or 5915 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 52.

The square root of 66389659 is about 8147.9849656219. The cubic root of 66389659 is about 404.9177478648.

The spelling of 66389659 in words is "sixty-six million, three hundred eighty-nine thousand, six hundred fifty-nine".