66664331 has 4 divisors (see below), whose sum is σ = 70173000. Its totient is φ = 63155664.

The previous prime is 66664321. The next prime is 66664349. The reversal of 66664331 is 13346666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66664331 - 2¹⁴ = 66647947 is a prime.

It is a super-3 number, since 3×66664331³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66664291 and 66664300.

It is not an unprimeable number, because it can be changed into a prime (66664321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754306 + ... + 1754343.

It is an arithmetic number, because the mean of its divisors is an integer number (17543250).

Almost surely, 2^66664331 is an apocalyptic number.

66664331 is a deficient number, since it is larger than the sum of its proper divisors (3508669).

66664331 is a wasteful number, since it uses less digits than its factorization.

66664331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508668.

The product of its digits is 46656, while the sum is 35.

The square root of 66664331 is about 8164.8227782359. The cubic root of 66664331 is about 405.4753976508.

The spelling of 66664331 in words is "sixty-six million, six hundred sixty-four thousand, three hundred thirty-one".