66421242238 has 12 divisors (see below), whose sum is σ = 107885391048. Its totient is φ = 30655957800.

The previous prime is 66421242191. The next prime is 66421242241. The reversal of 66421242238 is 83224212466.

It is a self number, because there is not a number n which added to its sum of digits gives 66421242238.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 98255938 + ... + 98256613.

It is an arithmetic number, because the mean of its divisors is an integer number (8990449254).

Almost surely, 2^66421242238 is an apocalyptic number.

66421242238 is a deficient number, since it is larger than the sum of its proper divisors (41464148810).

66421242238 is a wasteful number, since it uses less digits than its factorization.

66421242238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196512579 (or 196512566 counting only the distinct ones).

The product of its digits is 221184, while the sum is 40.

The spelling of 66421242238 in words is "sixty-six billion, four hundred twenty-one million, two hundred forty-two thousand, two hundred thirty-eight".