66660565161000 has 128 divisors (see below), whose sum is σ = 208025743536000. Its totient is φ = 17772323340800.

The previous prime is 66660565160971. The next prime is 66660565161007. The reversal of 66660565161000 is 16156506666.

It is not an unprimeable number, because it can be changed into a prime (66660565161007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11557219 + ... + 16336781.

It is an arithmetic number, because the mean of its divisors is an integer number (1625201121375).

Almost surely, 2^{66660565161000} is an apocalyptic number.

66660565161000 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 66660565161000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104012871768000).

66660565161000 is an abundant number, since it is smaller than the sum of its proper divisors (141365178375000).

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

66660565161000 is a wasteful number, since it uses less digits than its factorization.

66660565161000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784236 (or 4784222 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 66660565161000 in words is "sixty-six trillion, six hundred sixty billion, five hundred sixty-five million, one hundred sixty-one thousand".