18381910091092 has 6 divisors (see below), whose sum is σ = 32168342659418. Its totient is φ = 9190955045544.

The previous prime is 18381910091063. The next prime is 18381910091093. The reversal of 18381910091092 is 29019001918381.

It can be written as a sum of positive squares in only one way, i.e., 18379689419716 + 2220671376 = 4287154^2 + 47124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381910091093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2297738761383 + ... + 2297738761390.

Almost surely, 2^{18381910091092} is an apocalyptic number.

It is an amenable number.

18381910091092 is a deficient number, since it is larger than the sum of its proper divisors (13786432568326).

18381910091092 is a wasteful number, since it uses less digits than its factorization.

18381910091092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595477522777 (or 4595477522775 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 52.

The spelling of 18381910091092 in words is "eighteen trillion, three hundred eighty-one billion, nine hundred ten million, ninety-one thousand, ninety-two".