66686196 has 24 divisors (see below), whose sum is σ = 160967520. Its totient is φ = 21462112.

The previous prime is 66686183. The next prime is 66686197. The reversal of 66686196 is 69168666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66686197) 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, 95466 + ... + 96161.

It is an arithmetic number, because the mean of its divisors is an integer number (6706980).

Almost surely, 2^66686196 is an apocalyptic number.

It is an amenable number.

66686196 is an abundant number, since it is smaller than the sum of its proper divisors (94281324).

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

66686196 is a wasteful number, since it uses less digits than its factorization.

66686196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191663 (or 191661 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 66686196 is about 8166.1616442488. The cubic root of 66686196 is about 405.5197229560.

The spelling of 66686196 in words is "sixty-six million, six hundred eighty-six thousand, one hundred ninety-six".