42404640066 has 24 divisors (see below), whose sum is σ = 91899132780. Its totient is φ = 14131431936.

The previous prime is 42404639993. The next prime is 42404640107. The reversal of 42404640066 is 66004640424.

It is a happy number.

42404640066 is a `hidden beast` number, since 4 + 2 + 4 + 0 + 4 + 640 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39376449225 + 3028190841 = 198435^2 + 55029^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42404640066.

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 11 ways as a sum of consecutive naturals, for example, 210955 + ... + 359598.

Almost surely, 2^42404640066 is an apocalyptic number.

42404640066 is an abundant number, since it is smaller than the sum of its proper divisors (49494492714).

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

42404640066 is a wasteful number, since it uses less digits than its factorization.

42404640066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574690 (or 574687 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 42404640066 in words is "forty-two billion, four hundred four million, six hundred forty thousand, sixty-six".