66209873338 has 16 divisors (see below), whose sum is σ = 113545422144. Its totient is φ = 28364964480.

The previous prime is 66209873309. The next prime is 66209873347. The reversal of 66209873338 is 83337890266.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 852768 + ... + 927163.

It is an arithmetic number, because the mean of its divisors is an integer number (7096588884).

Almost surely, 2^66209873338 is an apocalyptic number.

66209873338 is a deficient number, since it is larger than the sum of its proper divisors (47335548806).

66209873338 is a wasteful number, since it uses less digits than its factorization.

66209873338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782597.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 66209873338 in words is "sixty-six billion, two hundred nine million, eight hundred seventy-three thousand, three hundred thirty-eight".