66168983808 has 72 divisors (see below), whose sum is σ = 195673346400. Its totient is φ = 22056325632.

The previous prime is 66168983801. The next prime is 66168983809. The reversal of 66168983808 is 80838986166.

66168983808 is a `hidden beast` number, since 6 + 6 + 168 + 98 + 380 + 8 = 666.

66168983808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66168983801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4779618 + ... + 4793441.

Almost surely, 2^66168983808 is an apocalyptic number.

It is an amenable number.

66168983808 is an abundant number, since it is smaller than the sum of its proper divisors (129504362592).

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

66168983808 is an equidigital number, since it uses as much as digits as its factorization.

66168983808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9573084 (or 9573064 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 63.

The spelling of 66168983808 in words is "sixty-six billion, one hundred sixty-eight million, nine hundred eighty-three thousand, eight hundred eight".