66040115 has 4 divisors (see below), whose sum is σ = 79248144. Its totient is φ = 52832088.

The previous prime is 66040111. The next prime is 66040171. The reversal of 66040115 is 51104066.

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 66040115 - 2² = 66040111 is a prime.

It is a super-2 number, since 2×66040115² = 8722593578426450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66040111) 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, 6604007 + ... + 6604016.

It is an arithmetic number, because the mean of its divisors is an integer number (19812036).

Almost surely, 2^66040115 is an apocalyptic number.

66040115 is a deficient number, since it is larger than the sum of its proper divisors (13208029).

66040115 is a wasteful number, since it uses less digits than its factorization.

66040115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13208028.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66040115 is about 8126.5069371779. The cubic root of 66040115 is about 404.2058614107.

The spelling of 66040115 in words is "sixty-six million, forty thousand, one hundred fifteen".