66189856847834 has 32 divisors (see below), whose sum is σ = 99627874560000. Its totient is φ = 32980746879360.

The previous prime is 66189856847801. The next prime is 66189856847839. The reversal of 66189856847834 is 43874865898166.

It is not an unprimeable number, because it can be changed into a prime (66189856847839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3608837504 + ... + 3608855844.

It is an arithmetic number, because the mean of its divisors is an integer number (3113371080000).

Almost surely, 2^{66189856847834} is an apocalyptic number.

66189856847834 is a deficient number, since it is larger than the sum of its proper divisors (33438017712166).

66189856847834 is a wasteful number, since it uses less digits than its factorization.

66189856847834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22958.

The product of its digits is 13377208320, while the sum is 83.

The spelling of 66189856847834 in words is "sixty-six trillion, one hundred eighty-nine billion, eight hundred fifty-six million, eight hundred forty-seven thousand, eight hundred thirty-four".