66696317 has 4 divisors (see below), whose sum is σ = 68996220. Its totient is φ = 64396416.

The previous prime is 66696307. The next prime is 66696349. The reversal of 66696317 is 71369666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29008996 + 37687321 = 5386^2 + 6139^2 .

It is a cyclic number.

It is not a de Polignac number, because 66696317 - 2²⁰ = 65647741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66696307) 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, 1149908 + ... + 1149965.

It is an arithmetic number, because the mean of its divisors is an integer number (17249055).

Almost surely, 2^66696317 is an apocalyptic number.

It is an amenable number.

66696317 is a deficient number, since it is larger than the sum of its proper divisors (2299903).

66696317 is a wasteful number, since it uses less digits than its factorization.

66696317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299902.

The product of its digits is 244944, while the sum is 44.

The square root of 66696317 is about 8166.7813121205. The cubic root of 66696317 is about 405.5402372341.

The spelling of 66696317 in words is "sixty-six million, six hundred ninety-six thousand, three hundred seventeen".