66008971 has 8 divisors (see below), whose sum is σ = 75651840. Its totient is φ = 56419368.

The previous prime is 66008963. The next prime is 66008981. The reversal of 66008971 is 17980066.

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 66008971 - 2³ = 66008963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66008971.

It is not an unprimeable number, because it can be changed into a prime (66008911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10621 + ... + 15646.

It is an arithmetic number, because the mean of its divisors is an integer number (9456480).

Almost surely, 2^66008971 is an apocalyptic number.

66008971 is a deficient number, since it is larger than the sum of its proper divisors (9642869).

66008971 is a wasteful number, since it uses less digits than its factorization.

66008971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26633.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 66008971 is about 8124.5905127582. The cubic root of 66008971 is about 404.1423113156.

The spelling of 66008971 in words is "sixty-six million, eight thousand, nine hundred seventy-one".