12134158978 has 4 divisors (see below), whose sum is σ = 18201238470. Its totient is φ = 6067079488.

The previous prime is 12134158961. The next prime is 12134159029. The reversal of 12134158978 is 87985143121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87985143121 = 30169 ⋅2916409.

It can be written as a sum of positive squares in only one way, i.e., 6679302529 + 5454856449 = 81727^2 + 73857^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3033539743 + ... + 3033539746.

Almost surely, 2^12134158978 is an apocalyptic number.

12134158978 is a deficient number, since it is larger than the sum of its proper divisors (6067079492).

12134158978 is an equidigital number, since it uses as much as digits as its factorization.

12134158978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6067079491.

The product of its digits is 483840, while the sum is 49.

The spelling of 12134158978 in words is "twelve billion, one hundred thirty-four million, one hundred fifty-eight thousand, nine hundred seventy-eight".