18858785676561 has 12 divisors (see below), whose sum is σ = 27647042352592. Its totient is φ = 12384874175256.

The previous prime is 18858785676517. The next prime is 18858785676593. The reversal of 18858785676561 is 16567658785881.

It is not a de Polignac number, because 18858785676561 - 2¹¹ = 18858785674513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18858785676461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15637466791 + ... + 15637467996.

Almost surely, 2^{18858785676561} is an apocalyptic number.

It is an amenable number.

18858785676561 is a deficient number, since it is larger than the sum of its proper divisors (8788256676031).

18858785676561 is a wasteful number, since it uses less digits than its factorization.

18858785676561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31274934860 (or 31274934857 counting only the distinct ones).

The product of its digits is 5419008000, while the sum is 81.

The spelling of 18858785676561 in words is "eighteen trillion, eight hundred fifty-eight billion, seven hundred eighty-five million, six hundred seventy-six thousand, five hundred sixty-one".