66208686 has 16 divisors (see below), whose sum is σ = 135647568. Its totient is φ = 21531200.

The previous prime is 66208661. The next prime is 66208687. The reversal of 66208686 is 68680266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66208687) 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, 134325 + ... + 134816.

It is an arithmetic number, because the mean of its divisors is an integer number (8477973).

Almost surely, 2^66208686 is an apocalyptic number.

66208686 is an abundant number, since it is smaller than the sum of its proper divisors (69438882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66208686 is a wasteful number, since it uses less digits than its factorization.

66208686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269187.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 66208686 is about 8136.8720034175. The cubic root of 66208686 is about 404.5494883791.

The spelling of 66208686 in words is "sixty-six million, two hundred eight thousand, six hundred eighty-six".