66804199200 has 864 divisors, whose sum is σ = 259879366656. Its totient is φ = 16710312960.

The previous prime is 66804199199. The next prime is 66804199211. The reversal of 66804199200 is 299140866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 299570289 + ... + 299570511.

It is an arithmetic number, because the mean of its divisors is an integer number (300786304).

Almost surely, 2^66804199200 is an apocalyptic number.

66804199200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66804199200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129939683328).

66804199200 is an abundant number, since it is smaller than the sum of its proper divisors (193075167456).

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

66804199200 is a wasteful number, since it uses less digits than its factorization.

66804199200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 66804199200 in words is "sixty-six billion, eight hundred four million, one hundred ninety-nine thousand, two hundred".