138682217858 has 30 divisors (see below), whose sum is σ = 219512577459. Its totient is φ = 65706406348.

The previous prime is 138682217837. The next prime is 138682217893. The reversal of 138682217858 is 858712286831.

It can be written as a sum of positive squares in only one way, i.e., 69341108929 + 69341108929 = 263327^2 + 263327^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=263327.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138682217797 and 138682217806.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1296095441 + ... + 1296095547.

Almost surely, 2^138682217858 is an apocalyptic number.

138682217858 is a deficient number, since it is larger than the sum of its proper divisors (80830359601).

138682217858 is an frugal number, since it uses more digits than its factorization.

138682217858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 132 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 59.

The spelling of 138682217858 in words is "one hundred thirty-eight billion, six hundred eighty-two million, two hundred seventeen thousand, eight hundred fifty-eight".