66692773723 has 4 divisors (see below), whose sum is σ = 67101932008. Its totient is φ = 66283615440.

The previous prime is 66692773717. The next prime is 66692773727. The reversal of 66692773723 is 32737729666.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66692773723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66692773727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204578898 + ... + 204579223.

It is an arithmetic number, because the mean of its divisors is an integer number (16775483002).

Almost surely, 2^66692773723 is an apocalyptic number.

66692773723 is a deficient number, since it is larger than the sum of its proper divisors (409158285).

66692773723 is a wasteful number, since it uses less digits than its factorization.

66692773723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409158284.

The product of its digits is 24004512, while the sum is 58.

The spelling of 66692773723 in words is "sixty-six billion, six hundred ninety-two million, seven hundred seventy-three thousand, seven hundred twenty-three".