18543855612 has 48 divisors (see below), whose sum is σ = 45913416192. Its totient is φ = 5805085440.

The previous prime is 18543855607. The next prime is 18543855679. The reversal of 18543855612 is 21655834581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3714 + ... + 192617.

It is an arithmetic number, because the mean of its divisors is an integer number (956529504).

Almost surely, 2^18543855612 is an apocalyptic number.

18543855612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18543855612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22956708096).

18543855612 is an abundant number, since it is smaller than the sum of its proper divisors (27369560580).

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

18543855612 is a wasteful number, since it uses less digits than its factorization.

18543855612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196818 (or 196816 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 48.

The spelling of 18543855612 in words is "eighteen billion, five hundred forty-three million, eight hundred fifty-five thousand, six hundred twelve".