66212165 has 8 divisors (see below), whose sum is σ = 79678080. Its totient is φ = 52820752.

The previous prime is 66212149. The next prime is 66212177. The reversal of 66212165 is 56121266.

66212165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66212165 - 2⁴ = 66212149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16649 + ... + 20238.

It is an arithmetic number, because the mean of its divisors is an integer number (9959760).

Almost surely, 2^66212165 is an apocalyptic number.

It is an amenable number.

66212165 is a deficient number, since it is larger than the sum of its proper divisors (13465915).

66212165 is a wasteful number, since it uses less digits than its factorization.

66212165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37251.

The product of its digits is 4320, while the sum is 29.

The square root of 66212165 is about 8137.0857805482. The cubic root of 66212165 is about 404.5565740709.

The spelling of 66212165 in words is "sixty-six million, two hundred twelve thousand, one hundred sixty-five".