66545809200 has 300 divisors, whose sum is σ = 257200548528. Its totient is φ = 16380403200.

The previous prime is 66545809159. The next prime is 66545809229. The reversal of 66545809200 is 290854566.

66545809200 is a `hidden beast` number, since 6 + 6 + 545 + 80 + 9 + 20 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (300).

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 59 ways as a sum of consecutive naturals, for example, 342205 + ... + 500195.

Almost surely, 2^66545809200 is an apocalyptic number.

66545809200 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 66545809200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128600274264).

66545809200 is an abundant number, since it is smaller than the sum of its proper divisors (190654739328).

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

66545809200 is a wasteful number, since it uses less digits than its factorization.

66545809200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158034 (or 158014 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 66545809200 in words is "sixty-six billion, five hundred forty-five million, eight hundred nine thousand, two hundred".