63641211666 has 32 divisors (see below), whose sum is σ = 128736216000. Its totient is φ = 20971526400.

The previous prime is 63641211629. The next prime is 63641211701. The reversal of 63641211666 is 66611214636.

It is a super-2 number, since 2×63641211666² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 5386966 + ... + 5398766.

It is an arithmetic number, because the mean of its divisors is an integer number (4023006750).

Almost surely, 2^63641211666 is an apocalyptic number.

63641211666 is an abundant number, since it is smaller than the sum of its proper divisors (65095004334).

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

63641211666 is a wasteful number, since it uses less digits than its factorization.

63641211666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21994.

The product of its digits is 186624, while the sum is 42.

The spelling of 63641211666 in words is "sixty-three billion, six hundred forty-one million, two hundred eleven thousand, six hundred sixty-six".