18019819819836 has 60 divisors (see below), whose sum is σ = 47295047451960. Its totient is φ = 5982675876000.

The previous prime is 18019819819829. The next prime is 18019819819843. The reversal of 18019819819836 is 63891891891081.

It is an interprime number because it is at equal distance from previous prime (18019819819829) and next prime (18019819819843).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 110708971 + ... + 110871618.

It is an arithmetic number, because the mean of its divisors is an integer number (788250790866).

Almost surely, 2^{18019819819836} is an apocalyptic number.

It is an amenable number.

18019819819836 is an abundant number, since it is smaller than the sum of its proper divisors (29275227632124).

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

18019819819836 is a wasteful number, since it uses less digits than its factorization.

18019819819836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221580856 (or 221580845 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 72.

The spelling of 18019819819836 in words is "eighteen trillion, nineteen billion, eight hundred nineteen million, eight hundred nineteen thousand, eight hundred thirty-six".