138809647911 has 16 divisors (see below), whose sum is σ = 203072031360. Its totient is φ = 83640772320.

The previous prime is 138809647901. The next prime is 138809647913. The reversal of 138809647911 is 119746908831.

It is not a de Polignac number, because 138809647911 - 2¹⁰ = 138809646887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138809647913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12151381 + ... + 12162798.

It is an arithmetic number, because the mean of its divisors is an integer number (12692001960).

Almost surely, 2^138809647911 is an apocalyptic number.

138809647911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138809647911 is a deficient number, since it is larger than the sum of its proper divisors (64262383449).

138809647911 is a wasteful number, since it uses less digits than its factorization.

138809647911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24314366.

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 138809647911 in words is "one hundred thirty-eight billion, eight hundred nine million, six hundred forty-seven thousand, nine hundred eleven".