66171113 has 4 divisors (see below), whose sum is σ = 66676368. Its totient is φ = 65665860.

The previous prime is 66171107. The next prime is 66171151. The reversal of 66171113 is 31117166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31117166 = 2 ⋅15558583.

It is a cyclic number.

It is not a de Polignac number, because 66171113 - 2⁴ = 66171097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66171103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252431 + ... + 252692.

It is an arithmetic number, because the mean of its divisors is an integer number (16669092).

Almost surely, 2^66171113 is an apocalyptic number.

It is an amenable number.

66171113 is a deficient number, since it is larger than the sum of its proper divisors (505255).

66171113 is a wasteful number, since it uses less digits than its factorization.

66171113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505254.

The product of its digits is 756, while the sum is 26.

The square root of 66171113 is about 8134.5628647150. The cubic root of 66171113 is about 404.4729474946.

Adding to 66171113 its reverse (31117166), we get a palindrome (97288279).

The spelling of 66171113 in words is "sixty-six million, one hundred seventy-one thousand, one hundred thirteen".