12318427997 has 4 divisors (see below), whose sum is σ = 12487173660. Its totient is φ = 12149682336.

The previous prime is 12318427973. The next prime is 12318428069. The reversal of 12318427997 is 79972481321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79972481321 = 43 ⋅1859825147.

It can be written as a sum of positive squares in 2 ways, for example, as 7208179801 + 5110248196 = 84901^2 + 71486^2 .

It is a cyclic number.

It is not a de Polignac number, because 12318427997 - 2⁸ = 12318427741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12318427697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84372722 + ... + 84372867.

It is an arithmetic number, because the mean of its divisors is an integer number (3121793415).

Almost surely, 2^12318427997 is an apocalyptic number.

It is an amenable number.

12318427997 is a deficient number, since it is larger than the sum of its proper divisors (168745663).

12318427997 is an equidigital number, since it uses as much as digits as its factorization.

12318427997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168745662.

The product of its digits is 1524096, while the sum is 53.

The spelling of 12318427997 in words is "twelve billion, three hundred eighteen million, four hundred twenty-seven thousand, nine hundred ninety-seven".