138888144520 has 32 divisors (see below), whose sum is σ = 320120239320. Its totient is φ = 54200250880.

The previous prime is 138888144511. The next prime is 138888144529. The reversal of 138888144520 is 25441888831.

It is an interprime number because it is at equal distance from previous prime (138888144511) and next prime (138888144529).

It can be written as a sum of positive squares in 4 ways, for example, as 40895355076 + 97992789444 = 202226^2 + 313038^2 .

It is not an unprimeable number, because it can be changed into a prime (138888144529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42342307 + ... + 42345586.

Almost surely, 2^138888144520 is an apocalyptic number.

138888144520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138888144520 is an abundant number, since it is smaller than the sum of its proper divisors (181232094800).

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

138888144520 is a wasteful number, since it uses less digits than its factorization.

138888144520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84687945 (or 84687941 counting only the distinct ones).

The product of its (nonzero) digits is 1966080, while the sum is 52.

The spelling of 138888144520 in words is "one hundred thirty-eight billion, eight hundred eighty-eight million, one hundred forty-four thousand, five hundred twenty".