66396517 has 8 divisors (see below), whose sum is σ = 72495072. Its totient is φ = 60308400.

The previous prime is 66396511. The next prime is 66396541. The reversal of 66396517 is 71569366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66396517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66396511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17418 + ... + 20884.

It is an arithmetic number, because the mean of its divisors is an integer number (9061884).

Almost surely, 2^66396517 is an apocalyptic number.

It is an amenable number.

66396517 is a deficient number, since it is larger than the sum of its proper divisors (6098555).

66396517 is a wasteful number, since it uses less digits than its factorization.

66396517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219.

The product of its digits is 204120, while the sum is 43.

The square root of 66396517 is about 8148.4057950006. The cubic root of 66396517 is about 404.9316899473.

The spelling of 66396517 in words is "sixty-six million, three hundred ninety-six thousand, five hundred seventeen".