66666976394 has 32 divisors (see below), whose sum is σ = 102155489280. Its totient is φ = 32624750592.

The previous prime is 66666976367. The next prime is 66666976457. The reversal of 66666976394 is 49367966666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7032842 + ... + 7042314.

It is an arithmetic number, because the mean of its divisors is an integer number (3192359040).

Almost surely, 2^66666976394 is an apocalyptic number.

66666976394 is a deficient number, since it is larger than the sum of its proper divisors (35488512886).

66666976394 is a wasteful number, since it uses less digits than its factorization.

66666976394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9974.

The product of its digits is 317447424, while the sum is 68.

The spelling of 66666976394 in words is "sixty-six billion, six hundred sixty-six million, nine hundred seventy-six thousand, three hundred ninety-four".