18721835166868 has 48 divisors (see below), whose sum is σ = 33620309420544. Its totient is φ = 9117985282560.

The previous prime is 18721835166857. The next prime is 18721835166869. The reversal of 18721835166868 is 86866153812781.

It is a super-2 number, since 2×18721835166868² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18721835166797 and 18721835166806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18721835166869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72227505 + ... + 72486247.

It is an arithmetic number, because the mean of its divisors is an integer number (700423112928).

Almost surely, 2^{18721835166868} is an apocalyptic number.

It is an amenable number.

18721835166868 is a deficient number, since it is larger than the sum of its proper divisors (14898474253676).

18721835166868 is a wasteful number, since it uses less digits than its factorization.

18721835166868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260632 (or 260630 counting only the distinct ones).

The product of its digits is 185794560, while the sum is 70.

The spelling of 18721835166868 in words is "eighteen trillion, seven hundred twenty-one billion, eight hundred thirty-five million, one hundred sixty-six thousand, eight hundred sixty-eight".