138256968869 has 4 divisors (see below), whose sum is σ = 139105171296. Its totient is φ = 137408766444.

The previous prime is 138256968853. The next prime is 138256968947. The reversal of 138256968869 is 968869652831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138256968869 - 2⁴ = 138256968853 is a prime.

It is a super-2 number, since 2×138256968869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138256968769) 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, 424100969 + ... + 424101294.

It is an arithmetic number, because the mean of its divisors is an integer number (34776292824).

Almost surely, 2^138256968869 is an apocalyptic number.

It is an amenable number.

138256968869 is a deficient number, since it is larger than the sum of its proper divisors (848202427).

138256968869 is an equidigital number, since it uses as much as digits as its factorization.

138256968869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848202426.

The product of its digits is 268738560, while the sum is 71.

The spelling of 138256968869 in words is "one hundred thirty-eight billion, two hundred fifty-six million, nine hundred sixty-eight thousand, eight hundred sixty-nine".