66983686 has 24 divisors (see below), whose sum is σ = 127507176. Its totient is φ = 26097120.

The previous prime is 66983677. The next prime is 66983701. The reversal of 66983686 is 68638966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29991 + ... + 32146.

It is an arithmetic number, because the mean of its divisors is an integer number (5312799).

Almost surely, 2^66983686 is an apocalyptic number.

66983686 is a deficient number, since it is larger than the sum of its proper divisors (60523490).

66983686 is a wasteful number, since it uses less digits than its factorization.

66983686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62164 (or 62157 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 52.

The square root of 66983686 is about 8184.3561750452. The cubic root of 66983686 is about 406.1218421469.

The spelling of 66983686 in words is "sixty-six million, nine hundred eighty-three thousand, six hundred eighty-six".