12516419249 has 2 divisors, whose sum is σ = 12516419250. Its totient is φ = 12516419248.

The previous prime is 12516419239. The next prime is 12516419323. The reversal of 12516419249 is 94291461521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12123111025 + 393308224 = 110105^2 + 19832^2 .

It is an emirp because it is prime and its reverse (94291461521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12516419249 - 2¹⁶ = 12516353713 is a prime.

It is not a weakly prime, because it can be changed into another prime (12516419239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6258209624 + 6258209625.

It is an arithmetic number, because the mean of its divisors is an integer number (6258209625).

Almost surely, 2^12516419249 is an apocalyptic number.

It is an amenable number.

12516419249 is a deficient number, since it is larger than the sum of its proper divisors (1).

12516419249 is an equidigital number, since it uses as much as digits as its factorization.

12516419249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The spelling of 12516419249 in words is "twelve billion, five hundred sixteen million, four hundred nineteen thousand, two hundred forty-nine".