66512317 has 4 divisors (see below), whose sum is σ = 66550176. Its totient is φ = 66474460.

The previous prime is 66512311. The next prime is 66512323. The reversal of 66512317 is 71321566.

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.

It is an interprime number because it is at equal distance from previous prime (66512311) and next prime (66512323).

It is a cyclic number.

It is not a de Polignac number, because 66512317 - 2³ = 66512309 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66512311) 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 3 ways as a sum of consecutive naturals, for example, 16159 + ... + 19852.

It is an arithmetic number, because the mean of its divisors is an integer number (16637544).

Almost surely, 2^66512317 is an apocalyptic number.

It is an amenable number.

66512317 is a deficient number, since it is larger than the sum of its proper divisors (37859).

66512317 is a wasteful number, since it uses less digits than its factorization.

66512317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37858.

The product of its digits is 7560, while the sum is 31.

The square root of 66512317 is about 8155.5083839084. The cubic root of 66512317 is about 405.1669626081.

Subtracting 66512317 from its reverse (71321566), we obtain a square (4809249 = 2193²).

The spelling of 66512317 in words is "sixty-six million, five hundred twelve thousand, three hundred seventeen".