66455320988672 has 264 divisors, whose sum is σ = 175663837547520. Its totient is φ = 24528957235200.

The previous prime is 66455320988669. The next prime is 66455320988741. The reversal of 66455320988672 is 27688902355466.

It is a junction number, because it is equal to n+sod(n) for n = 66455320988596 and 66455320988605.

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, 14462897 + ... + 18495567.

Almost surely, 2^{66455320988672} 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 66455320988672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87831918773760).

66455320988672 is an abundant number, since it is smaller than the sum of its proper divisors (109208516558848).

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

66455320988672 is a wasteful number, since it uses less digits than its factorization.

66455320988672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032739 (or 4032710 counting only the distinct ones).

The product of its (nonzero) digits is 1045094400, while the sum is 71.

The spelling of 66455320988672 in words is "sixty-six trillion, four hundred fifty-five billion, three hundred twenty million, nine hundred eighty-eight thousand, six hundred seventy-two".