66696082139 has 4 divisors (see below), whose sum is σ = 66696628320. Its totient is φ = 66695535960.

The previous prime is 66696082073. The next prime is 66696082199. The reversal of 66696082139 is 93128069666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66696082139 - 2²⁰ = 66695033563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66696082199) 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, 3374 + ... + 365244.

It is an arithmetic number, because the mean of its divisors is an integer number (16674157080).

Almost surely, 2^66696082139 is an apocalyptic number.

66696082139 is a deficient number, since it is larger than the sum of its proper divisors (546181).

66696082139 is a wasteful number, since it uses less digits than its factorization.

66696082139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546180.

The product of its (nonzero) digits is 5038848, while the sum is 56.

The spelling of 66696082139 in words is "sixty-six billion, six hundred ninety-six million, eighty-two thousand, one hundred thirty-nine".