66908685 has 16 divisors (see below), whose sum is σ = 113351616. Its totient is φ = 33585408.

The previous prime is 66908659. The next prime is 66908689. The reversal of 66908685 is 58680966.

It is not a de Polignac number, because 66908685 - 2¹² = 66904589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66908689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130939 + ... + 131448.

It is an arithmetic number, because the mean of its divisors is an integer number (7084476).

Almost surely, 2^66908685 is an apocalyptic number.

It is an amenable number.

66908685 is a deficient number, since it is larger than the sum of its proper divisors (46442931).

66908685 is a wasteful number, since it uses less digits than its factorization.

66908685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262412.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 66908685 is about 8179.7729186084. The cubic root of 66908685 is about 405.9702086094.

The spelling of 66908685 in words is "sixty-six million, nine hundred eight thousand, six hundred eighty-five".