66516165 has 24 divisors (see below), whose sum is σ = 115521120. Its totient is φ = 35405664.

The previous prime is 66516097. The next prime is 66516179. The reversal of 66516165 is 56161566.

It is not a de Polignac number, because 66516165 - 2⁸ = 66515909 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 (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28534 + ... + 30776.

It is an arithmetic number, because the mean of its divisors is an integer number (4813380).

Almost surely, 2^66516165 is an apocalyptic number.

It is an amenable number.

66516165 is a deficient number, since it is larger than the sum of its proper divisors (49004955).

66516165 is a wasteful number, since it uses less digits than its factorization.

66516165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913 (or 2910 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 66516165 is about 8155.7442946674. The cubic root of 66516165 is about 405.1747759600.

The spelling of 66516165 in words is "sixty-six million, five hundred sixteen thousand, one hundred sixty-five".