66600194779 has 8 divisors (see below), whose sum is σ = 66737729520. Its totient is φ = 66462796896.

The previous prime is 66600194747. The next prime is 66600194807. The reversal of 66600194779 is 97749100666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66600194779 - 2⁵ = 66600194747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66600194179) 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, 970237 + ... + 1036609.

It is an arithmetic number, because the mean of its divisors is an integer number (8342216190).

Almost surely, 2^66600194779 is an apocalyptic number.

66600194779 is a deficient number, since it is larger than the sum of its proper divisors (137534741).

66600194779 is a wasteful number, since it uses less digits than its factorization.

66600194779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68429.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 66600194779 in words is "sixty-six billion, six hundred million, one hundred ninety-four thousand, seven hundred seventy-nine".