138256968868 has 24 divisors (see below), whose sum is σ = 254754007200. Its totient is φ = 65472113088.

The previous prime is 138256968853. The next prime is 138256968947. The reversal of 138256968868 is 868869652831.

It is a super-2 number, since 2×138256968868² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (70) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 138256968797 and 138256968806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29496 + ... + 526672.

It is an arithmetic number, because the mean of its divisors is an integer number (10614750300).

Almost surely, 2^138256968868 is an apocalyptic number.

It is an amenable number.

138256968868 is a deficient number, since it is larger than the sum of its proper divisors (116497038332).

138256968868 is a wasteful number, since it uses less digits than its factorization.

138256968868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500859 (or 500857 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 70.

The spelling of 138256968868 in words is "one hundred thirty-eight billion, two hundred fifty-six million, nine hundred sixty-eight thousand, eight hundred sixty-eight".