1800018019836 has 48 divisors (see below), whose sum is σ = 4676706478080. Its totient is φ = 598721180400.

The previous prime is 1800018019829. The next prime is 1800018019837. The reversal of 1800018019836 is 6389108100081.

It is a junction number, because it is equal to n+sod(n) for n = 1800018019791 and 1800018019800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800018019837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17794140 + ... + 17895011.

It is an arithmetic number, because the mean of its divisors is an integer number (97431384960).

Almost surely, 2^{1800018019836} is an apocalyptic number.

It is an amenable number.

1800018019836 is an abundant number, since it is smaller than the sum of its proper divisors (2876688458244).

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

1800018019836 is a wasteful number, since it uses less digits than its factorization.

1800018019836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35689631 (or 35689623 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 1800018019836 in words is "one trillion, eight hundred billion, eighteen million, nineteen thousand, eight hundred thirty-six".