66538844108 has 24 divisors (see below), whose sum is σ = 127762986960. Its totient is φ = 30070099520.

The previous prime is 66538844107. The next prime is 66538844153. The reversal of 66538844108 is 80144883566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66538844108.

It is not an unprimeable number, because it can be changed into a prime (66538844107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4363043 + ... + 4378266.

It is an arithmetic number, because the mean of its divisors is an integer number (5323457790).

Almost surely, 2^66538844108 is an apocalyptic number.

It is an amenable number.

66538844108 is a deficient number, since it is larger than the sum of its proper divisors (61224142852).

66538844108 is a wasteful number, since it uses less digits than its factorization.

66538844108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8741497 (or 8741495 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 53.

The spelling of 66538844108 in words is "sixty-six billion, five hundred thirty-eight million, eight hundred forty-four thousand, one hundred eight".