66799171 has 12 divisors (see below), whose sum is σ = 72889168. Its totient is φ = 61160832.

The previous prime is 66799163. The next prime is 66799177. The reversal of 66799171 is 17199766.

It is not a de Polignac number, because 66799171 - 2³ = 66799163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66799177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7570 + ... + 13816.

Almost surely, 2^66799171 is an apocalyptic number.

66799171 is a deficient number, since it is larger than the sum of its proper divisors (6089997).

66799171 is a wasteful number, since it uses less digits than its factorization.

66799171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6318 (or 6301 counting only the distinct ones).

The product of its digits is 142884, while the sum is 46.

The square root of 66799171 is about 8173.0759815384. The cubic root of 66799171 is about 405.7485946286.

The spelling of 66799171 in words is "sixty-six million, seven hundred ninety-nine thousand, one hundred seventy-one".