18686255382 has 12 divisors (see below), whose sum is σ = 40486886700. Its totient is φ = 6228751788.

The previous prime is 18686255321. The next prime is 18686255383. The reversal of 18686255382 is 28355268681.

18686255382 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 6 + 2 + 553 + 82 = 666.

It is a super-2 number, since 2×18686255382² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686255383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 519062632 + ... + 519062667.

It is an arithmetic number, because the mean of its divisors is an integer number (3373907225).

Almost surely, 2^18686255382 is an apocalyptic number.

18686255382 is an abundant number, since it is smaller than the sum of its proper divisors (21800631318).

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

18686255382 is a wasteful number, since it uses less digits than its factorization.

18686255382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038125307 (or 1038125304 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The spelling of 18686255382 in words is "eighteen billion, six hundred eighty-six million, two hundred fifty-five thousand, three hundred eighty-two".