138545221892 has 72 divisors (see below), whose sum is σ = 307876826880. Its totient is φ = 53943839040.

The previous prime is 138545221889. The next prime is 138545221907. The reversal of 138545221892 is 298122545831.

It is a self number, because there is not a number n which added to its sum of digits gives 138545221892.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3457709 + ... + 3497547.

It is an arithmetic number, because the mean of its divisors is an integer number (4276067040).

Almost surely, 2^138545221892 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138545221892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153938413440).

138545221892 is an abundant number, since it is smaller than the sum of its proper divisors (169331604988).

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

138545221892 is a wasteful number, since it uses less digits than its factorization.

138545221892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41481 (or 41472 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 50.

The spelling of 138545221892 in words is "one hundred thirty-eight billion, five hundred forty-five million, two hundred twenty-one thousand, eight hundred ninety-two".