66693839666 has 16 divisors (see below), whose sum is σ = 101421264768. Its totient is φ = 32886842400.

The previous prime is 66693839633. The next prime is 66693839683.

66693839666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66693839666² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66693839596 and 66693839605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2179331 + ... + 2209721.

It is an arithmetic number, because the mean of its divisors is an integer number (6338829048).

Almost surely, 2^66693839666 is an apocalyptic number.

66693839666 is a deficient number, since it is larger than the sum of its proper divisors (34727425102).

66693839666 is a wasteful number, since it uses less digits than its factorization.

66693839666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45497.

The product of its digits is 272097792, while the sum is 68.

The spelling of 66693839666 in words is "sixty-six billion, six hundred ninety-three million, eight hundred thirty-nine thousand, six hundred sixty-six".