138481818808 has 8 divisors (see below), whose sum is σ = 259653410280. Its totient is φ = 69240909400.

The previous prime is 138481818803. The next prime is 138481818833. The reversal of 138481818808 is 808818184831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138481818803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8655113668 + ... + 8655113683.

It is an arithmetic number, because the mean of its divisors is an integer number (32456676285).

Almost surely, 2^138481818808 is an apocalyptic number.

It is an amenable number.

138481818808 is a deficient number, since it is larger than the sum of its proper divisors (121171591472).

138481818808 is a wasteful number, since it uses less digits than its factorization.

138481818808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17310227357 (or 17310227353 counting only the distinct ones).

The product of its (nonzero) digits is 3145728, while the sum is 58.

The spelling of 138481818808 in words is "one hundred thirty-eight billion, four hundred eighty-one million, eight hundred eighteen thousand, eight hundred eight".