6664420636 has 24 divisors (see below), whose sum is σ = 11765609856. Its totient is φ = 3302914800.

The previous prime is 6664420627. The next prime is 6664420669. The reversal of 6664420636 is 6360244666.

It is a junction number, because it is equal to n+sod(n) for n = 6664420592 and 6664420601.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 270255 + ... + 293881.

It is an arithmetic number, because the mean of its divisors is an integer number (490233744).

Almost surely, 2^6664420636 is an apocalyptic number.

It is an amenable number.

6664420636 is a deficient number, since it is larger than the sum of its proper divisors (5101189220).

6664420636 is a wasteful number, since it uses less digits than its factorization.

6664420636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24249 (or 24247 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 43.

The square root of 6664420636 is about 81635.9028614249. The cubic root of 6664420636 is about 1881.8606744437.

The spelling of 6664420636 in words is "six billion, six hundred sixty-four million, four hundred twenty thousand, six hundred thirty-six".