138517636749 has 8 divisors (see below), whose sum is σ = 186765353280. Its totient is φ = 91307505696.

The previous prime is 138517636721. The next prime is 138517636783. The reversal of 138517636749 is 947636715831.

It is a happy number.

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

It is not a de Polignac number, because 138517636749 - 2¹² = 138517632653 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138517636692 and 138517636701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138517636349) 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, 259396057 + ... + 259396590.

It is an arithmetic number, because the mean of its divisors is an integer number (23345669160).

Almost surely, 2^138517636749 is an apocalyptic number.

It is an amenable number.

138517636749 is a deficient number, since it is larger than the sum of its proper divisors (48247716531).

138517636749 is an equidigital number, since it uses as much as digits as its factorization.

138517636749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518792739.

The product of its digits is 22861440, while the sum is 60.

The spelling of 138517636749 in words is "one hundred thirty-eight billion, five hundred seventeen million, six hundred thirty-six thousand, seven hundred forty-nine".