12661731659 has 2 divisors, whose sum is σ = 12661731660. Its totient is φ = 12661731658.

The previous prime is 12661731601. The next prime is 12661731661. The reversal of 12661731659 is 95613716621.

It is a strong prime.

It is an emirp because it is prime and its reverse (95613716621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12661731659 - 2¹² = 12661727563 is a prime.

Together with 12661731661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12661731059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330865829 + 6330865830.

It is an arithmetic number, because the mean of its divisors is an integer number (6330865830).

Almost surely, 2^12661731659 is an apocalyptic number.

12661731659 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661731659 is an equidigital number, since it uses as much as digits as its factorization.

12661731659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The spelling of 12661731659 in words is "twelve billion, six hundred sixty-one million, seven hundred thirty-one thousand, six hundred fifty-nine".