66643101140340 has 288 divisors, whose sum is σ = 204579312602112. Its totient is φ = 16136818790400.

The previous prime is 66643101140303. The next prime is 66643101140393. The reversal of 66643101140340 is 4304110134666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3464309202 + ... + 3464328438.

It is an arithmetic number, because the mean of its divisors is an integer number (710344835424).

Almost surely, 2^{66643101140340} is an apocalyptic number.

66643101140340 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 66643101140340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102289656301056).

66643101140340 is an abundant number, since it is smaller than the sum of its proper divisors (137936211461772).

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

66643101140340 is a wasteful number, since it uses less digits than its factorization.

66643101140340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19959 (or 19626 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 66643101140340 in words is "sixty-six trillion, six hundred forty-three billion, one hundred one million, one hundred forty thousand, three hundred forty".