12431136266 has 4 divisors (see below), whose sum is σ = 18646704402. Its totient is φ = 6215568132.

The previous prime is 12431136181. The next prime is 12431136281. The reversal of 12431136266 is 66263113421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66263113421 = 173 ⋅383023777.

It can be written as a sum of positive squares in only one way, i.e., 11982586225 + 448550041 = 109465^2 + 21179^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3107784065 + ... + 3107784068.

Almost surely, 2^12431136266 is an apocalyptic number.

12431136266 is a deficient number, since it is larger than the sum of its proper divisors (6215568136).

12431136266 is an equidigital number, since it uses as much as digits as its factorization.

12431136266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6215568135.

The product of its digits is 31104, while the sum is 35.

Adding to 12431136266 its reverse (66263113421), we get a palindrome (78694249687).

The spelling of 12431136266 in words is "twelve billion, four hundred thirty-one million, one hundred thirty-six thousand, two hundred sixty-six".