66711065 has 8 divisors (see below), whose sum is σ = 80307720. Its totient is φ = 53199232.

The previous prime is 66711061. The next prime is 66711079. The reversal of 66711065 is 56011766.

It can be written as a sum of positive squares in 4 ways, for example, as 10220809 + 56490256 = 3197^2 + 7516^2 .

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 66711065 - 2² = 66711061 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66711061) 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 7 ways as a sum of consecutive naturals, for example, 19460 + ... + 22629.

It is an arithmetic number, because the mean of its divisors is an integer number (10038465).

Almost surely, 2^66711065 is an apocalyptic number.

It is an amenable number.

66711065 is a deficient number, since it is larger than the sum of its proper divisors (13596655).

66711065 is a wasteful number, since it uses less digits than its factorization.

66711065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42411.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 66711065 is about 8167.6841883119. The cubic root of 66711065 is about 405.5701262740.

The spelling of 66711065 in words is "sixty-six million, seven hundred eleven thousand, sixty-five".