18872171716856 has 16 divisors (see below), whose sum is σ = 37247707336200. Its totient is φ = 8939449760544.

The previous prime is 18872171716841. The next prime is 18872171716859. The reversal of 18872171716856 is 65861717127881.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62079512075 + ... + 62079512378.

Almost surely, 2^{18872171716856} is an apocalyptic number.

It is an amenable number.

18872171716856 is a deficient number, since it is larger than the sum of its proper divisors (18375535619344).

18872171716856 is a wasteful number, since it uses less digits than its factorization.

18872171716856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124159024478 (or 124159024474 counting only the distinct ones).

The product of its digits is 63221760, while the sum is 68.

The spelling of 18872171716856 in words is "eighteen trillion, eight hundred seventy-two billion, one hundred seventy-one million, seven hundred sixteen thousand, eight hundred fifty-six".