66695985 has 24 divisors (see below), whose sum is σ = 121692480. Its totient is φ = 33698592.

The previous prime is 66695983. The next prime is 66696037. The reversal of 66695985 is 58959666.

It is not a de Polignac number, because 66695985 - 2¹ = 66695983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66695983) 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, 38149 + ... + 39858.

It is an arithmetic number, because the mean of its divisors is an integer number (5070520).

Almost surely, 2^66695985 is an apocalyptic number.

It is an amenable number.

66695985 is a deficient number, since it is larger than the sum of its proper divisors (54996495).

66695985 is a wasteful number, since it uses less digits than its factorization.

66695985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78037 (or 78034 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 66695985 is about 8166.7609858499. The cubic root of 66695985 is about 405.5395643354.

The spelling of 66695985 in words is "sixty-six million, six hundred ninety-five thousand, nine hundred eighty-five".