66385617 has 8 divisors (see below), whose sum is σ = 88656960. Its totient is φ = 44185680.

The previous prime is 66385603. The next prime is 66385633. The reversal of 66385617 is 71658366.

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

It is a de Polignac number, because none of the positive numbers 2^k-66385617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66385217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15642 + ... + 19427.

It is an arithmetic number, because the mean of its divisors is an integer number (11082120).

Almost surely, 2^66385617 is an apocalyptic number.

It is an amenable number.

66385617 is a deficient number, since it is larger than the sum of its proper divisors (22271343).

66385617 is a wasteful number, since it uses less digits than its factorization.

66385617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35703.

The product of its digits is 181440, while the sum is 42.

The square root of 66385617 is about 8147.7369250608. The cubic root of 66385617 is about 404.9095301656.

The spelling of 66385617 in words is "sixty-six million, three hundred eighty-five thousand, six hundred seventeen".