66795866657 has 8 divisors (see below), whose sum is σ = 71938488384. Its totient is φ = 61653884688.

The previous prime is 66795866653. The next prime is 66795866681. The reversal of 66795866657 is 75666859766.

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 66795866657 - 2² = 66795866653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66795866653) 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, 69068 + ... + 371970.

It is an arithmetic number, because the mean of its divisors is an integer number (8992311048).

Almost surely, 2^66795866657 is an apocalyptic number.

It is an amenable number.

66795866657 is a deficient number, since it is larger than the sum of its proper divisors (5142621727).

66795866657 is a wasteful number, since it uses less digits than its factorization.

66795866657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319879.

The product of its digits is 685843200, while the sum is 71.

The spelling of 66795866657 in words is "sixty-six billion, seven hundred ninety-five million, eight hundred sixty-six thousand, six hundred fifty-seven".