18872171716851 has 12 divisors (see below), whose sum is σ = 27259846024320. Its totient is φ = 12581428226640.

The previous prime is 18872171716841. The next prime is 18872171716859. The reversal of 18872171716851 is 15861717127881.

It is a happy number.

It is not a de Polignac number, because 18872171716851 - 2²³ = 18872163328243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18872171716859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6721006 + ... + 9105836.

It is an arithmetic number, because the mean of its divisors is an integer number (2271653835360).

Almost surely, 2^{18872171716851} is an apocalyptic number.

18872171716851 is a deficient number, since it is larger than the sum of its proper divisors (8387674307469).

18872171716851 is a wasteful number, since it uses less digits than its factorization.

18872171716851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264106 (or 3264103 counting only the distinct ones).

The product of its digits is 10536960, while the sum is 63.

The spelling of 18872171716851 in words is "eighteen trillion, eight hundred seventy-two billion, one hundred seventy-one million, seven hundred sixteen thousand, eight hundred fifty-one".