641166066 has 24 divisors (see below), whose sum is σ = 1389692304. Its totient is φ = 213645240.

The previous prime is 641165989. The next prime is 641166089. The reversal of 641166066 is 660661146.

641166066 is a `hidden beast` number, since 6 + 41 + 1 + 6 + 606 + 6 = 666.

It is a super-2 number, since 2×641166066² = 822187848379832712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641166066.

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 11 ways as a sum of consecutive naturals, for example, 69285 + ... + 77991.

It is an arithmetic number, because the mean of its divisors is an integer number (57903846).

Almost surely, 2^641166066 is an apocalyptic number.

641166066 is an abundant number, since it is smaller than the sum of its proper divisors (748526238).

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

641166066 is a wasteful number, since it uses less digits than its factorization.

641166066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12806 (or 12803 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 641166066 is about 25321.2571962768. The cubic root of 641166066 is about 862.2969361901.

The spelling of 641166066 in words is "six hundred forty-one million, one hundred sixty-six thousand, sixty-six".