66670721998200 has 288 divisors, whose sum is σ = 233729787657600. Its totient is φ = 16999140660480.

The previous prime is 66670721998193. The next prime is 66670721998271. The reversal of 66670721998200 is 289912707666.

It is a super-2 number, since 2×66670721998200² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 104797467 + ... + 105431733.

It is an arithmetic number, because the mean of its divisors is an integer number (811561762700).

Almost surely, 2^{66670721998200} is an apocalyptic number.

66670721998200 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 66670721998200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116864893828800).

66670721998200 is an abundant number, since it is smaller than the sum of its proper divisors (167059065659400).

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

66670721998200 is a wasteful number, since it uses less digits than its factorization.

66670721998200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636851 (or 636839 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 66670721998200 in words is "sixty-six trillion, six hundred seventy billion, seven hundred twenty-one million, nine hundred ninety-eight thousand, two hundred".