66708117 has 24 divisors (see below), whose sum is σ = 114202816. Its totient is φ = 38117952.

The previous prime is 66708113. The next prime is 66708137. The reversal of 66708117 is 71180766.

It is a happy number.

It is not a de Polignac number, because 66708117 - 2² = 66708113 is a prime.

It is a super-3 number, since 3×66708117³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17908 + ... + 21309.

Almost surely, 2^66708117 is an apocalyptic number.

It is an amenable number.

66708117 is a deficient number, since it is larger than the sum of its proper divisors (47494699).

66708117 is an equidigital number, since it uses as much as digits as its factorization.

66708117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39239 (or 39227 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 66708117 is about 8167.5037190074. The cubic root of 66708117 is about 405.5641520609.

The spelling of 66708117 in words is "sixty-six million, seven hundred eight thousand, one hundred seventeen".