12136787609 has 2 divisors, whose sum is σ = 12136787610. Its totient is φ = 12136787608.

The previous prime is 12136787603. The next prime is 12136787647. The reversal of 12136787609 is 90678763121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8532586384 + 3604201225 = 92372^2 + 60035^2 .

It is a cyclic number.

It is not a de Polignac number, because 12136787609 - 2²⁴ = 12120010393 is a prime.

It is a super-2 number, since 2×12136787609² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12136787603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6068393804 + 6068393805.

It is an arithmetic number, because the mean of its divisors is an integer number (6068393805).

Almost surely, 2^12136787609 is an apocalyptic number.

It is an amenable number.

12136787609 is a deficient number, since it is larger than the sum of its proper divisors (1).

12136787609 is an equidigital number, since it uses as much as digits as its factorization.

12136787609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 12136787609 in words is "twelve billion, one hundred thirty-six million, seven hundred eighty-seven thousand, six hundred nine".