66768801792 has 624 divisors, whose sum is σ = 239613878592. Its totient is φ = 16294871040.

The previous prime is 66768801787. The next prime is 66768801817. The reversal of 66768801792 is 29710886766.

It is a super-2 number, since 2×66768801792² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112594648 + ... + 112595240.

Almost surely, 2^66768801792 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 66768801792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119806939296).

66768801792 is an abundant number, since it is smaller than the sum of its proper divisors (172845076800).

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

66768801792 is a wasteful number, since it uses less digits than its factorization.

66768801792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 66768801792 in words is "sixty-six billion, seven hundred sixty-eight million, eight hundred one thousand, seven hundred ninety-two".