66005115 has 16 divisors (see below), whose sum is σ = 115209216. Its totient is φ = 32002400.

The previous prime is 66005113. The next prime is 66005119. The reversal of 66005115 is 51150066.

It is not a de Polignac number, because 66005115 - 2¹ = 66005113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66005113) 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 15 ways as a sum of consecutive naturals, for example, 199851 + ... + 200180.

It is an arithmetic number, because the mean of its divisors is an integer number (7200576).

Almost surely, 2^66005115 is an apocalyptic number.

66005115 is a deficient number, since it is larger than the sum of its proper divisors (49204101).

66005115 is a wasteful number, since it uses less digits than its factorization.

66005115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400050.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 66005115 is about 8124.3532050250. The cubic root of 66005115 is about 404.1344416626.

It can be divided in two parts, 660051 and 15, that added together give a palindrome (660066).

The spelling of 66005115 in words is "sixty-six million, five thousand, one hundred fifteen".