66940317 has 8 divisors (see below), whose sum is σ = 99170880. Its totient is φ = 44626860.

The previous prime is 66940309. The next prime is 66940319. The reversal of 66940317 is 71304966.

It is not a de Polignac number, because 66940317 - 2³ = 66940309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66940319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1239609 + ... + 1239662.

It is an arithmetic number, because the mean of its divisors is an integer number (12396360).

Almost surely, 2^66940317 is an apocalyptic number.

It is an amenable number.

66940317 is a deficient number, since it is larger than the sum of its proper divisors (32230563).

66940317 is a wasteful number, since it uses less digits than its factorization.

66940317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479280 (or 2479274 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 66940317 is about 8181.7062401433. The cubic root of 66940317 is about 406.0341745279.

The spelling of 66940317 in words is "sixty-six million, nine hundred forty thousand, three hundred seventeen".