138303857881 has 4 divisors (see below), whose sum is σ = 158061551872. Its totient is φ = 118546163892.

The previous prime is 138303857851. The next prime is 138303857891. The reversal of 138303857881 is 188758303831.

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 138303857881 - 2¹³ = 138303849689 is a prime.

It is a super-2 number, since 2×138303857881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138303857821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9878846985 + ... + 9878846998.

It is an arithmetic number, because the mean of its divisors is an integer number (39515387968).

Almost surely, 2^138303857881 is an apocalyptic number.

It is an amenable number.

138303857881 is a deficient number, since it is larger than the sum of its proper divisors (19757693991).

138303857881 is an equidigital number, since it uses as much as digits as its factorization.

138303857881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19757693990.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 138303857881 in words is "one hundred thirty-eight billion, three hundred three million, eight hundred fifty-seven thousand, eight hundred eighty-one".