66188293660 has 24 divisors (see below), whose sum is σ = 141069978000. Its totient is φ = 26080162944.

The previous prime is 66188293627. The next prime is 66188293667. The reversal of 66188293660 is 6639288166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66188293667) 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 7 ways as a sum of consecutive naturals, for example, 24695785 + ... + 24698464.

It is an arithmetic number, because the mean of its divisors is an integer number (5877915750).

Almost surely, 2^66188293660 is an apocalyptic number.

It is an amenable number.

66188293660 is an abundant number, since it is smaller than the sum of its proper divisors (74881684340).

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

66188293660 is a wasteful number, since it uses less digits than its factorization.

66188293660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49394325 (or 49394323 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 66188293660 in words is "sixty-six billion, one hundred eighty-eight million, two hundred ninety-three thousand, six hundred sixty".