138717868749 has 8 divisors (see below), whose sum is σ = 185126382432. Its totient is φ = 92393967120.

The previous prime is 138717868739. The next prime is 138717868763. The reversal of 138717868749 is 947868717831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138717868749 - 2²³ = 138709480141 is a prime.

It is a super-2 number, since 2×138717868749² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138717868739) 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 7 ways as a sum of consecutive naturals, for example, 21149187 + ... + 21155744.

It is an arithmetic number, because the mean of its divisors is an integer number (23140797804).

Almost surely, 2^138717868749 is an apocalyptic number.

It is an amenable number.

138717868749 is a deficient number, since it is larger than the sum of its proper divisors (46408513683).

138717868749 is a wasteful number, since it uses less digits than its factorization.

138717868749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42306027.

The product of its digits is 113799168, while the sum is 69.

The spelling of 138717868749 in words is "one hundred thirty-eight billion, seven hundred seventeen million, eight hundred sixty-eight thousand, seven hundred forty-nine".