138917871044 has 6 divisors (see below), whose sum is σ = 243106274334. Its totient is φ = 69458935520.

The previous prime is 138917871023. The next prime is 138917871047. The reversal of 138917871044 is 440178719831.

It can be written as a sum of positive squares in only one way, i.e., 127957874944 + 10959996100 = 357712^2 + 104690^2 .

It is not an unprimeable number, because it can be changed into a prime (138917871047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17364733877 + ... + 17364733884.

It is an arithmetic number, because the mean of its divisors is an integer number (40517712389).

Almost surely, 2^138917871044 is an apocalyptic number.

It is an amenable number.

138917871044 is a deficient number, since it is larger than the sum of its proper divisors (104188403290).

138917871044 is a wasteful number, since it uses less digits than its factorization.

138917871044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34729467765 (or 34729467763 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 138917871044 in words is "one hundred thirty-eight billion, nine hundred seventeen million, eight hundred seventy-one thousand, forty-four".