66351213792 has 216 divisors, whose sum is σ = 201432447216. Its totient is φ = 20645566464.

The previous prime is 66351213757. The next prime is 66351213833. The reversal of 66351213792 is 29731215366.

66351213792 is a `hidden beast` number, since 6 + 63 + 512 + 1 + 3 + 79 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 252285853 + ... + 252286115.

It is an arithmetic number, because the mean of its divisors is an integer number (932557626).

Almost surely, 2^66351213792 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 66351213792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100716223608).

66351213792 is an abundant number, since it is smaller than the sum of its proper divisors (135081233424).

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

66351213792 is a wasteful number, since it uses less digits than its factorization.

66351213792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 512 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The spelling of 66351213792 in words is "sixty-six billion, three hundred fifty-one million, two hundred thirteen thousand, seven hundred ninety-two".