666161650660 has 96 divisors (see below), whose sum is σ = 1548106608384. Its totient is φ = 238752192000.

The previous prime is 666161650579. The next prime is 666161650733. The reversal of 666161650660 is 66056161666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75174630 + ... + 75183490.

It is an arithmetic number, because the mean of its divisors is an integer number (16126110504).

Almost surely, 2^666161650660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666161650660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774053304192).

666161650660 is an abundant number, since it is smaller than the sum of its proper divisors (881944957724).

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

666161650660 is a wasteful number, since it uses less digits than its factorization.

666161650660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13765 (or 13763 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 666161650660 in words is "six hundred sixty-six billion, one hundred sixty-one million, six hundred fifty thousand, six hundred sixty".