66644186532 has 48 divisors (see below), whose sum is σ = 193873999872. Its totient is φ = 17310178080.

The previous prime is 66644186519. The next prime is 66644186533. The reversal of 66644186532 is 23568144666.

It is not an unprimeable number, because it can be changed into a prime (66644186533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36061948 + ... + 36063795.

It is an arithmetic number, because the mean of its divisors is an integer number (4039041664).

Almost surely, 2^66644186532 is an apocalyptic number.

It is an amenable number.

66644186532 is an abundant number, since it is smaller than the sum of its proper divisors (127229813340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66644186532 is a wasteful number, since it uses less digits than its factorization.

66644186532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72125768 (or 72125766 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 51.

The spelling of 66644186532 in words is "sixty-six billion, six hundred forty-four million, one hundred eighty-six thousand, five hundred thirty-two".