66136321 has 16 divisors (see below), whose sum is σ = 72354240. Its totient is φ = 60238080.

The previous prime is 66136313. The next prime is 66136331. The reversal of 66136321 is 12363166.

It is a cyclic number.

It is not a de Polignac number, because 66136321 - 2³ = 66136313 is a prime.

It is a Duffinian number.

Its product of digits (3888) is a multiple of the sum of its prime divisors (1296).

It is a self number, because there is not a number n which added to its sum of digits gives 66136321.

It is not an unprimeable number, because it can be changed into a prime (66136331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56286 + ... + 57448.

It is an arithmetic number, because the mean of its divisors is an integer number (4522140).

Almost surely, 2^66136321 is an apocalyptic number.

It is an amenable number.

66136321 is a deficient number, since it is larger than the sum of its proper divisors (6217919).

66136321 is a wasteful number, since it uses less digits than its factorization.

66136321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its digits is 3888, while the sum is 28.

The square root of 66136321 is about 8132.4240543641. The cubic root of 66136321 is about 404.4020460129.

Adding to 66136321 its reverse (12363166), we get a palindrome (78499487).

The spelling of 66136321 in words is "sixty-six million, one hundred thirty-six thousand, three hundred twenty-one".