138815530318 has 4 divisors (see below), whose sum is σ = 208223295480. Its totient is φ = 69407765158.

The previous prime is 138815530309. The next prime is 138815530319. The reversal of 138815530318 is 813035518831.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×138815530318² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138815530319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34703882578 + ... + 34703882581.

It is an arithmetic number, because the mean of its divisors is an integer number (52055823870).

Almost surely, 2^138815530318 is an apocalyptic number.

138815530318 is a deficient number, since it is larger than the sum of its proper divisors (69407765162).

138815530318 is an equidigital number, since it uses as much as digits as its factorization.

138815530318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69407765161.

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 138815530318 in words is "one hundred thirty-eight billion, eight hundred fifteen million, five hundred thirty thousand, three hundred eighteen".