138135809136 has 80 divisors (see below), whose sum is σ = 404527303040. Its totient is φ = 40266305280.

The previous prime is 138135809101. The next prime is 138135809153. The reversal of 138135809136 is 631908531831.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5813710 + ... + 5837421.

It is an arithmetic number, because the mean of its divisors is an integer number (5056591288).

Almost surely, 2^138135809136 is an apocalyptic number.

138135809136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138135809136 is an abundant number, since it is smaller than the sum of its proper divisors (266391493904).

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

138135809136 is a wasteful number, since it uses less digits than its factorization.

138135809136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11651174 (or 11651168 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 138135809136 in words is "one hundred thirty-eight billion, one hundred thirty-five million, eight hundred nine thousand, one hundred thirty-six".