642123575884 has 24 divisors (see below), whose sum is σ = 1359791102880. Its totient is φ = 259007828736.

The previous prime is 642123575879. The next prime is 642123575903. The reversal of 642123575884 is 488575321246.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674499079 + ... + 674500030.

It is an arithmetic number, because the mean of its divisors is an integer number (56657962620).

Almost surely, 2^642123575884 is an apocalyptic number.

It is an amenable number.

642123575884 is an abundant number, since it is smaller than the sum of its proper divisors (717667526996).

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

642123575884 is a wasteful number, since it uses less digits than its factorization.

642123575884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348999137 (or 1348999135 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 55.

The spelling of 642123575884 in words is "six hundred forty-two billion, one hundred twenty-three million, five hundred seventy-five thousand, eight hundred eighty-four".