1660865727180 has 192 divisors, whose sum is σ = 5251699224576. Its totient is φ = 388540416000.

The previous prime is 1660865727163. The next prime is 1660865727187. The reversal of 1660865727180 is 817275680661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1660865727180.

It is not an unprimeable number, because it can be changed into a prime (1660865727187) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7107400 + ... + 7337360.

It is an arithmetic number, because the mean of its divisors is an integer number (27352600128).

Almost surely, 2^{1660865727180} is an apocalyptic number.

1660865727180 is a gapful number since it is divisible by the number (10) 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 1660865727180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2625849612288).

1660865727180 is an abundant number, since it is smaller than the sum of its proper divisors (3590833497396).

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

1660865727180 is a wasteful number, since it uses less digits than its factorization.

1660865727180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230368 (or 230366 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 1660865727180 in words is "one trillion, six hundred sixty billion, eight hundred sixty-five million, seven hundred twenty-seven thousand, one hundred eighty".