18187971950568 has 96 divisors (see below), whose sum is σ = 53243881104960. Its totient is φ = 5162149036800.

The previous prime is 18187971950557. The next prime is 18187971950581. The reversal of 18187971950568 is 86505917978181.

It is a self number, because there is not a number n which added to its sum of digits gives 18187971950568.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51034221 + ... + 51389372.

It is an arithmetic number, because the mean of its divisors is an integer number (554623761510).

Almost surely, 2^{18187971950568} is an apocalyptic number.

It is an amenable number.

18187971950568 is an abundant number, since it is smaller than the sum of its proper divisors (35055909154392).

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

18187971950568 is a wasteful number, since it uses less digits than its factorization.

18187971950568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102423767 (or 102423756 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 75.

The spelling of 18187971950568 in words is "eighteen trillion, one hundred eighty-seven billion, nine hundred seventy-one million, nine hundred fifty thousand, five hundred sixty-eight".