66688383994 has 32 divisors (see below), whose sum is σ = 101891091456. Its totient is φ = 32729235840.

The previous prime is 66688383973. The next prime is 66688384019. The reversal of 66688383994 is 49938388666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39389812 + ... + 39391504.

It is an arithmetic number, because the mean of its divisors is an integer number (3184096608).

Almost surely, 2^66688383994 is an apocalyptic number.

66688383994 is a deficient number, since it is larger than the sum of its proper divisors (35202707462).

66688383994 is a wasteful number, since it uses less digits than its factorization.

66688383994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830.

The product of its digits is 322486272, while the sum is 70.

The spelling of 66688383994 in words is "sixty-six billion, six hundred eighty-eight million, three hundred eighty-three thousand, nine hundred ninety-four".