18856581860 has 48 divisors (see below), whose sum is σ = 40193822592. Its totient is φ = 7429497600.

The previous prime is 18856581853. The next prime is 18856581941. The reversal of 18856581860 is 6818565881.

It is a junction number, because it is equal to n+sod(n) for n = 18856581796 and 18856581805.

It is an unprimeable number.

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, 1688495 + ... + 1699625.

It is an arithmetic number, because the mean of its divisors is an integer number (837371304).

Almost surely, 2^18856581860 is an apocalyptic number.

18856581860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18856581860 is an abundant number, since it is smaller than the sum of its proper divisors (21337240732).

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

18856581860 is a wasteful number, since it uses less digits than its factorization.

18856581860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12404 (or 12402 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 56.

The spelling of 18856581860 in words is "eighteen billion, eight hundred fifty-six million, five hundred eighty-one thousand, eight hundred sixty".