66213165 has 32 divisors (see below), whose sum is σ = 110906496. Its totient is φ = 33696000.

The previous prime is 66213131. The next prime is 66213187. The reversal of 66213165 is 56131266.

It is not a de Polignac number, because 66213165 - 2¹² = 66209069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28290 + ... + 30540.

It is an arithmetic number, because the mean of its divisors is an integer number (3465828).

Almost surely, 2^66213165 is an apocalyptic number.

It is an amenable number.

66213165 is a deficient number, since it is larger than the sum of its proper divisors (44693331).

66213165 is a wasteful number, since it uses less digits than its factorization.

66213165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349.

The product of its digits is 6480, while the sum is 30.

The square root of 66213165 is about 8137.1472273764. The cubic root of 66213165 is about 404.5586107285.

The spelling of 66213165 in words is "sixty-six million, two hundred thirteen thousand, one hundred sixty-five".