18218781578332 has 12 divisors (see below), whose sum is σ = 32096846741400. Its totient is φ = 9048253937936.

The previous prime is 18218781578321. The next prime is 18218781578359. The reversal of 18218781578332 is 23387518781281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15284212138 + ... + 15284213329.

It is an arithmetic number, because the mean of its divisors is an integer number (2674737228450).

Almost surely, 2^{18218781578332} is an apocalyptic number.

It is an amenable number.

18218781578332 is a deficient number, since it is larger than the sum of its proper divisors (13878065163068).

18218781578332 is a wasteful number, since it uses less digits than its factorization.

18218781578332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30568425620 (or 30568425618 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 64.

The spelling of 18218781578332 in words is "eighteen trillion, two hundred eighteen billion, seven hundred eighty-one million, five hundred seventy-eight thousand, three hundred thirty-two".