12651666499 has 2 divisors, whose sum is σ = 12651666500. Its totient is φ = 12651666498.

The previous prime is 12651666493. The next prime is 12651666589. The reversal of 12651666499 is 99466615621.

It is a weak prime.

It is an emirp because it is prime and its reverse (99466615621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12651666499 - 2⁷ = 12651666371 is a prime.

It is not a weakly prime, because it can be changed into another prime (12651666493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6325833249 + 6325833250.

It is an arithmetic number, because the mean of its divisors is an integer number (6325833250).

Almost surely, 2^12651666499 is an apocalyptic number.

12651666499 is a deficient number, since it is larger than the sum of its proper divisors (1).

12651666499 is an equidigital number, since it uses as much as digits as its factorization.

12651666499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 55.

The spelling of 12651666499 in words is "twelve billion, six hundred fifty-one million, six hundred sixty-six thousand, four hundred ninety-nine".