15312216138 has 16 divisors (see below), whose sum is σ = 30648391680. Its totient is φ = 5100078816.

The previous prime is 15312216119. The next prime is 15312216163. The reversal of 15312216138 is 83161221351.

It is a super-3 number, since 3×15312216138³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15312216099 and 15312216108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989995 + ... + 1005342.

It is an arithmetic number, because the mean of its divisors is an integer number (1915524480).

Almost surely, 2^15312216138 is an apocalyptic number.

15312216138 is an abundant number, since it is smaller than the sum of its proper divisors (15336175542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15312216138 is a wasteful number, since it uses less digits than its factorization.

15312216138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996621.

The product of its digits is 8640, while the sum is 33.

Adding to 15312216138 its reverse (83161221351), we get a palindrome (98473437489).

The spelling of 15312216138 in words is "fifteen billion, three hundred twelve million, two hundred sixteen thousand, one hundred thirty-eight".