666160641666 has 256 divisors, whose sum is σ = 1715216186880. Its totient is φ = 189819002880.

The previous prime is 666160641583. The next prime is 666160641737. The reversal of 666160641666 is 666146061666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 568881261 + ... + 568882431.

It is an arithmetic number, because the mean of its divisors is an integer number (6700063230).

Almost surely, 2^666160641666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666160641666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857608093440).

666160641666 is an abundant number, since it is smaller than the sum of its proper divisors (1049055545214).

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

666160641666 is a wasteful number, since it uses less digits than its factorization.

666160641666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 666160641666 in words is "six hundred sixty-six billion, one hundred sixty million, six hundred forty-one thousand, six hundred sixty-six".