19818365112 has 192 divisors, whose sum is σ = 69538560000. Its totient is φ = 4951694592.

The previous prime is 19818365057. The next prime is 19818365141. The reversal of 19818365112 is 21156381891.

19818365112 is a `hidden beast` number, since 1 + 98 + 18 + 36 + 511 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44889 + ... + 204087.

It is an arithmetic number, because the mean of its divisors is an integer number (362180000).

Almost surely, 2^19818365112 is an apocalyptic number.

19818365112 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 19818365112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34769280000).

19818365112 is an abundant number, since it is smaller than the sum of its proper divisors (49720194888).

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

19818365112 is a wasteful number, since it uses less digits than its factorization.

19818365112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159250 (or 159243 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The spelling of 19818365112 in words is "nineteen billion, eight hundred eighteen million, three hundred sixty-five thousand, one hundred twelve".