138443948650 has 24 divisors (see below), whose sum is σ = 294292280160. Its totient is φ = 47466496560.

The previous prime is 138443948641. The next prime is 138443948651. The reversal of 138443948650 is 56849344831.

It is a junction number, because it is equal to n+sod(n) for n = 138443948591 and 138443948600.

It is not an unprimeable number, because it can be changed into a prime (138443948651) 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 in 11 ways as a sum of consecutive naturals, for example, 197776720 + ... + 197777419.

It is an arithmetic number, because the mean of its divisors is an integer number (12262178340).

Almost surely, 2^138443948650 is an apocalyptic number.

138443948650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138443948650 is an abundant number, since it is smaller than the sum of its proper divisors (155848331510).

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

138443948650 is a wasteful number, since it uses less digits than its factorization.

138443948650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395554158 (or 395554153 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 138443948650 in words is "one hundred thirty-eight billion, four hundred forty-three million, nine hundred forty-eight thousand, six hundred fifty".