18787734551322 has 72 divisors (see below), whose sum is σ = 44744825911968. Its totient is φ = 5693121347760.

The previous prime is 18787734551231. The next prime is 18787734551323. The reversal of 18787734551322 is 22315543778781.

18787734551322 is a `hidden beast` number, since 1 + 8 + 7 + 8 + 7 + 73 + 4 + 551 + 3 + 2 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18787734551322.

It is not an unprimeable number, because it can be changed into a prime (18787734551323) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 138293913 + ... + 138429699.

It is an arithmetic number, because the mean of its divisors is an integer number (621455915444).

Almost surely, 2^{18787734551322} is an apocalyptic number.

18787734551322 is an abundant number, since it is smaller than the sum of its proper divisors (25957091360646).

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

18787734551322 is a wasteful number, since it uses less digits than its factorization.

18787734551322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199344 (or 199330 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 63.

The spelling of 18787734551322 in words is "eighteen trillion, seven hundred eighty-seven billion, seven hundred thirty-four million, five hundred fifty-one thousand, three hundred twenty-two".