12651658361 has 2 divisors, whose sum is σ = 12651658362. Its totient is φ = 12651658360.

The previous prime is 12651658309. The next prime is 12651658363. The reversal of 12651658361 is 16385615621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507182736 + 5144475625 = 86644^2 + 71725^2 .

It is an emirp because it is prime and its reverse (16385615621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12651658361 - 2⁶ = 12651658297 is a prime.

It is a super-2 number, since 2×12651658361² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 12651658363, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12651658363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6325829180 + 6325829181.

It is an arithmetic number, because the mean of its divisors is an integer number (6325829181).

Almost surely, 2^12651658361 is an apocalyptic number.

It is an amenable number.

12651658361 is a deficient number, since it is larger than the sum of its proper divisors (1).

12651658361 is an equidigital number, since it uses as much as digits as its factorization.

12651658361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 44.

The spelling of 12651658361 in words is "twelve billion, six hundred fifty-one million, six hundred fifty-eight thousand, three hundred sixty-one".