66871065 has 8 divisors (see below), whose sum is σ = 106993728. Its totient is φ = 35664560.

The previous prime is 66871037. The next prime is 66871069. The reversal of 66871065 is 56017866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66871065 - 2⁵ = 66871033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66871069) 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, 2229021 + ... + 2229050.

It is an arithmetic number, because the mean of its divisors is an integer number (13374216).

Almost surely, 2^66871065 is an apocalyptic number.

It is an amenable number.

66871065 is a deficient number, since it is larger than the sum of its proper divisors (40122663).

66871065 is a wasteful number, since it uses less digits than its factorization.

66871065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4458079.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 66871065 is about 8177.4730204385. The cubic root of 66871065 is about 405.8941075645.

The spelling of 66871065 in words is "sixty-six million, eight hundred seventy-one thousand, sixty-five".