66685318695 has 24 divisors (see below), whose sum is σ = 118275979536. Its totient is φ = 34738397568.

The previous prime is 66685318657. The next prime is 66685318699. The reversal of 66685318695 is 59681358666.

66685318695 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66685318695 - 2²⁰ = 66684270119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66685318699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17229414 + ... + 17233283.

It is an arithmetic number, because the mean of its divisors is an integer number (4928165814).

Almost surely, 2^66685318695 is an apocalyptic number.

66685318695 is a deficient number, since it is larger than the sum of its proper divisors (51590660841).

66685318695 is a wasteful number, since it uses less digits than its factorization.

66685318695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34462751 (or 34462748 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The spelling of 66685318695 in words is "sixty-six billion, six hundred eighty-five million, three hundred eighteen thousand, six hundred ninety-five".