66171712 has 28 divisors (see below), whose sum is σ = 131595876. Its totient is φ = 33013760.

The previous prime is 66171697. The next prime is 66171739. The reversal of 66171712 is 21717166.

66171712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 51609856 + 14561856 = 7184^2 + 3816^2 .

It is a super-3 number, since 3×66171712³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40218 + ... + 41830.

Almost surely, 2^66171712 is an apocalyptic number.

It is an amenable number.

66171712 is a deficient number, since it is larger than the sum of its proper divisors (65424164).

66171712 is a wasteful number, since it uses less digits than its factorization.

66171712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266 (or 2256 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 66171712 is about 8134.5996828363. The cubic root of 66171712 is about 404.4741679596.

Adding to 66171712 its reverse (21717166), we get a palindrome (87888878).

The spelling of 66171712 in words is "sixty-six million, one hundred seventy-one thousand, seven hundred twelve".