66923942695 has 4 divisors (see below), whose sum is σ = 80308731240. Its totient is φ = 53539154152.

The previous prime is 66923942693. The next prime is 66923942713. The reversal of 66923942695 is 59624932966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66923942695 - 2¹ = 66923942693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66923942693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6692394265 + ... + 6692394274.

It is an arithmetic number, because the mean of its divisors is an integer number (20077182810).

Almost surely, 2^66923942695 is an apocalyptic number.

66923942695 is a deficient number, since it is larger than the sum of its proper divisors (13384788545).

66923942695 is a wasteful number, since it uses less digits than its factorization.

66923942695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13384788544.

The product of its digits is 37791360, while the sum is 61.

The spelling of 66923942695 in words is "sixty-six billion, nine hundred twenty-three million, nine hundred forty-two thousand, six hundred ninety-five".