18180019998036 has 36 divisors (see below), whose sum is σ = 49490054440372. Its totient is φ = 5593852306944.

The previous prime is 18180019998017. The next prime is 18180019998059. The reversal of 18180019998036 is 63089991008181.

It can be written as a sum of positive squares in 2 ways, for example, as 7590267441936 + 10589752556100 = 2755044^2 + 3254190^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19423097821 + ... + 19423098756.

Almost surely, 2^{18180019998036} is an apocalyptic number.

It is an amenable number.

18180019998036 is an abundant number, since it is smaller than the sum of its proper divisors (31310034442336).

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

18180019998036 is a wasteful number, since it uses less digits than its factorization.

18180019998036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38846196600 (or 38846196595 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 63.

The spelling of 18180019998036 in words is "eighteen trillion, one hundred eighty billion, nineteen million, nine hundred ninety-eight thousand, thirty-six".