12351122561 has 2 divisors, whose sum is σ = 12351122562. Its totient is φ = 12351122560.

The previous prime is 12351122513. The next prime is 12351122593. The reversal of 12351122561 is 16522115321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11994630400 + 356492161 = 109520^2 + 18881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12351122561 is a prime.

It is a super-3 number, since 3×12351122561³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (12351122461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6175561280 + 6175561281.

It is an arithmetic number, because the mean of its divisors is an integer number (6175561281).

Almost surely, 2^12351122561 is an apocalyptic number.

It is an amenable number.

12351122561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12351122561 is an equidigital number, since it uses as much as digits as its factorization.

12351122561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 29.

Adding to 12351122561 its reverse (16522115321), we get a palindrome (28873237882).

The spelling of 12351122561 in words is "twelve billion, three hundred fifty-one million, one hundred twenty-two thousand, five hundred sixty-one".