1218193595872 has 48 divisors (see below), whose sum is σ = 2770250423472. Its totient is φ = 521152337920.

The previous prime is 1218193595869. The next prime is 1218193595887. The reversal of 1218193595872 is 2785953918121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218193595872.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101781583 + ... + 101793550.

It is an arithmetic number, because the mean of its divisors is an integer number (57713550489).

Almost surely, 2^{1218193595872} is an apocalyptic number.

It is an amenable number.

1218193595872 is an abundant number, since it is smaller than the sum of its proper divisors (1552056827600).

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

1218193595872 is a wasteful number, since it uses less digits than its factorization.

1218193595872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203575171 (or 203575163 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 61.

The spelling of 1218193595872 in words is "one trillion, two hundred eighteen billion, one hundred ninety-three million, five hundred ninety-five thousand, eight hundred seventy-two".