138068787582820 has 12 divisors (see below), whose sum is σ = 289944453923964. Its totient is φ = 55227515033120.

The previous prime is 138068787582809. The next prime is 138068787582821. The reversal of 138068787582820 is 28285787860831.

It can be written as a sum of positive squares in 2 ways, for example, as 47525912361216 + 90542875221604 = 6893904^2 + 9515402^2 .

It is not an unprimeable number, because it can be changed into a prime (138068787582821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3451719689551 + ... + 3451719689590.

It is an arithmetic number, because the mean of its divisors is an integer number (24162037826997).

Almost surely, 2^{138068787582820} is an apocalyptic number.

138068787582820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138068787582820 is an abundant number, since it is smaller than the sum of its proper divisors (151875666341144).

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

138068787582820 is a wasteful number, since it uses less digits than its factorization.

138068787582820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6903439379150 (or 6903439379148 counting only the distinct ones).

The product of its (nonzero) digits is 578027520, while the sum is 73.

The spelling of 138068787582820 in words is "one hundred thirty-eight trillion, sixty-eight billion, seven hundred eighty-seven million, five hundred eighty-two thousand, eight hundred twenty".