12556722319 has 2 divisors, whose sum is σ = 12556722320. Its totient is φ = 12556722318.

The previous prime is 12556722289. The next prime is 12556722341. The reversal of 12556722319 is 91322765521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12556722319 is a prime.

It is a super-2 number, since 2×12556722319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12556722349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278361159 + 6278361160.

It is an arithmetic number, because the mean of its divisors is an integer number (6278361160).

Almost surely, 2^12556722319 is an apocalyptic number.

12556722319 is a deficient number, since it is larger than the sum of its proper divisors (1).

12556722319 is an equidigital number, since it uses as much as digits as its factorization.

12556722319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 43.

The spelling of 12556722319 in words is "twelve billion, five hundred fifty-six million, seven hundred twenty-two thousand, three hundred nineteen".