138663717808 has 240 divisors, whose sum is σ = 359475992064. Its totient is φ = 51136081920.

The previous prime is 138663717791. The next prime is 138663717821. The reversal of 138663717808 is 808717366831.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19236541 + ... + 19243747.

Almost surely, 2^138663717808 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 138663717808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179737996032).

138663717808 is an abundant number, since it is smaller than the sum of its proper divisors (220812274256).

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

138663717808 is a wasteful number, since it uses less digits than its factorization.

138663717808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7360 (or 7347 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 138663717808 in words is "one hundred thirty-eight billion, six hundred sixty-three million, seven hundred seventeen thousand, eight hundred eight".