138512163140 has 24 divisors (see below), whose sum is σ = 313250584920. Its totient is φ = 51142952448.

The previous prime is 138512163137. The next prime is 138512163143. The reversal of 138512163140 is 41361215831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138512163137) and next prime (138512163143).

It can be written as a sum of positive squares in 4 ways, for example, as 443439364 + 138068723776 = 21058^2 + 371576^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138512163140.

It is not an unprimeable number, because it can be changed into a prime (138512163143) 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, 266369285 + ... + 266369804.

It is an arithmetic number, because the mean of its divisors is an integer number (13052107705).

Almost surely, 2^138512163140 is an apocalyptic number.

138512163140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138512163140 is an abundant number, since it is smaller than the sum of its proper divisors (174738421780).

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

138512163140 is a wasteful number, since it uses less digits than its factorization.

138512163140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532739111 (or 532739109 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 138512163140 its reverse (41361215831), we get a palindrome (179873378971).

The spelling of 138512163140 in words is "one hundred thirty-eight billion, five hundred twelve million, one hundred sixty-three thousand, one hundred forty".