12509544659 has 2 divisors, whose sum is σ = 12509544660. Its totient is φ = 12509544658.

The previous prime is 12509544643. The next prime is 12509544709. The reversal of 12509544659 is 95644590521.

It is a happy number.

It is an a-pointer prime, because the next prime (12509544709) can be obtained adding 12509544659 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12509544659 - 2⁴ = 12509544643 is a prime.

It is not a weakly prime, because it can be changed into another prime (12509544629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254772329 + 6254772330.

It is an arithmetic number, because the mean of its divisors is an integer number (6254772330).

Almost surely, 2^12509544659 is an apocalyptic number.

12509544659 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509544659 is an equidigital number, since it uses as much as digits as its factorization.

12509544659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 12509544659 in words is "twelve billion, five hundred nine million, five hundred forty-four thousand, six hundred fifty-nine".