18138231600412 has 48 divisors (see below), whose sum is σ = 39641741814528. Its totient is φ = 7054804494720.

The previous prime is 18138231600383. The next prime is 18138231600431. The reversal of 18138231600412 is 21400613283181.

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, 49981353 + ... + 50342944.

It is an arithmetic number, because the mean of its divisors is an integer number (825869621136).

Almost surely, 2^{18138231600412} is an apocalyptic number.

It is an amenable number.

18138231600412 is an abundant number, since it is smaller than the sum of its proper divisors (21503510214116).

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

18138231600412 is a wasteful number, since it uses less digits than its factorization.

18138231600412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100324906 (or 100324904 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

Adding to 18138231600412 its reverse (21400613283181), we get a palindrome (39538844883593).

The spelling of 18138231600412 in words is "eighteen trillion, one hundred thirty-eight billion, two hundred thirty-one million, six hundred thousand, four hundred twelve".