66485799968 has 144 divisors (see below), whose sum is σ = 157876205760. Its totient is φ = 26988229632.

The previous prime is 66485799937. The next prime is 66485799971. The reversal of 66485799968 is 86999758466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9981023 + ... + 9987681.

It is an arithmetic number, because the mean of its divisors is an integer number (1096362540).

Almost surely, 2^66485799968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66485799968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78938102880).

66485799968 is an abundant number, since it is smaller than the sum of its proper divisors (91390405792).

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

66485799968 is a wasteful number, since it uses less digits than its factorization.

66485799968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6787 (or 6750 counting only the distinct ones).

The product of its digits is 1410877440, while the sum is 77.

The spelling of 66485799968 in words is "sixty-six billion, four hundred eighty-five million, seven hundred ninety-nine thousand, nine hundred sixty-eight".