18481944355140 has 144 divisors (see below), whose sum is σ = 61479149098752. Its totient is φ = 4134562596864.

The previous prime is 18481944355123. The next prime is 18481944355141. The reversal of 18481944355140 is 4155344918481.

It is not an unprimeable number, because it can be changed into a prime (18481944355141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66738157 + ... + 67014516.

It is an arithmetic number, because the mean of its divisors is an integer number (426938535408).

Almost surely, 2^{18481944355140} is an apocalyptic number.

18481944355140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18481944355140 is an abundant number, since it is smaller than the sum of its proper divisors (42997204743612).

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

18481944355140 is a wasteful number, since it uses less digits than its factorization.

18481944355140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133752746 (or 133752737 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 57.

The spelling of 18481944355140 in words is "eighteen trillion, four hundred eighty-one billion, nine hundred forty-four million, three hundred fifty-five thousand, one hundred forty".