66061392064512 has 416 divisors, whose sum is σ = 192971264172288. Its totient is φ = 19976567390208.

The previous prime is 66061392064433. The next prime is 66061392064597. The reversal of 66061392064512 is 21546029316066.

It is a tau number, because it is divible by the number of its divisors (416).

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 31 ways as a sum of consecutive naturals, for example, 4741354698 + ... + 4741368630.

Almost surely, 2^{66061392064512} 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 66061392064512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96485632086144).

66061392064512 is an abundant number, since it is smaller than the sum of its proper divisors (126909872107776).

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

66061392064512 is a wasteful number, since it uses less digits than its factorization.

66061392064512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14483 (or 14461 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 66061392064512 in words is "sixty-six trillion, sixty-one billion, three hundred ninety-two million, sixty-four thousand, five hundred twelve".