66664245888 has 64 divisors (see below), whose sum is σ = 196752124800. Its totient is φ = 22221414144.

The previous prime is 66664245773. The next prime is 66664245913. The reversal of 66664245888 is 88854246666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

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, 9641256 + ... + 9648167.

It is an arithmetic number, because the mean of its divisors is an integer number (3074251950).

Almost surely, 2^66664245888 is an apocalyptic number.

It is an amenable number.

66664245888 is an abundant number, since it is smaller than the sum of its proper divisors (130087878912).

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

66664245888 is a wasteful number, since it uses less digits than its factorization.

66664245888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19289446 (or 19289428 counting only the distinct ones).

The product of its digits is 106168320, while the sum is 63.

The spelling of 66664245888 in words is "sixty-six billion, six hundred sixty-four million, two hundred forty-five thousand, eight hundred eighty-eight".