138818826257 has 4 divisors (see below), whose sum is σ = 140491342320. Its totient is φ = 137146310196.

The previous prime is 138818826229. The next prime is 138818826259. The reversal of 138818826257 is 752628818831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752628818831 = 533353 ⋅1411127.

It is a cyclic number.

It is not a de Polignac number, because 138818826257 - 2¹⁶ = 138818760721 is a prime.

It is a super-3 number, since 3×138818826257³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138818826196 and 138818826205.

It is not an unprimeable number, because it can be changed into a prime (138818826259) 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, 836257907 + ... + 836258072.

It is an arithmetic number, because the mean of its divisors is an integer number (35122835580).

Almost surely, 2^138818826257 is an apocalyptic number.

It is an amenable number.

138818826257 is a deficient number, since it is larger than the sum of its proper divisors (1672516063).

138818826257 is an equidigital number, since it uses as much as digits as its factorization.

138818826257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672516062.

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

The spelling of 138818826257 in words is "one hundred thirty-eight billion, eight hundred eighteen million, eight hundred twenty-six thousand, two hundred fifty-seven".