12158310138 has 64 divisors (see below), whose sum is σ = 27997062912. Its totient is φ = 3486735360.

The previous prime is 12158310133. The next prime is 12158310139. The reversal of 12158310138 is 83101385121.

It is a junction number, because it is equal to n+sod(n) for n = 12158310099 and 12158310108.

It is not an unprimeable number, because it can be changed into a prime (12158310133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92068 + ... + 181088.

It is an arithmetic number, because the mean of its divisors is an integer number (437454108).

Almost surely, 2^12158310138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12158310138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13998531456).

12158310138 is an abundant number, since it is smaller than the sum of its proper divisors (15838752774).

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

12158310138 is a wasteful number, since it uses less digits than its factorization.

12158310138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89159.

The product of its (nonzero) digits is 5760, while the sum is 33.

Adding to 12158310138 its reverse (83101385121), we get a palindrome (95259695259).

The spelling of 12158310138 in words is "twelve billion, one hundred fifty-eight million, three hundred ten thousand, one hundred thirty-eight".