66909492800 has 168 divisors, whose sum is σ = 168778245120. Its totient is φ = 26098329600.

The previous prime is 66909492757. The next prime is 66909492829. The reversal of 66909492800 is 829490966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11986010 + ... + 11991590.

Almost surely, 2^66909492800 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 66909492800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84389122560).

66909492800 is an abundant number, since it is smaller than the sum of its proper divisors (101868752320).

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

66909492800 is a wasteful number, since it uses less digits than its factorization.

66909492800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5789 (or 5774 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 66909492800 in words is "sixty-six billion, nine hundred nine million, four hundred ninety-two thousand, eight hundred".