12657431489 has 2 divisors, whose sum is σ = 12657431490. Its totient is φ = 12657431488.

The previous prime is 12657431443. The next prime is 12657431513. The reversal of 12657431489 is 98413475621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12299919025 + 357512464 = 110905^2 + 18908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12657431489 is a prime.

It is not a weakly prime, because it can be changed into another prime (12657491489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328715744 + 6328715745.

It is an arithmetic number, because the mean of its divisors is an integer number (6328715745).

Almost surely, 2^12657431489 is an apocalyptic number.

It is an amenable number.

12657431489 is a deficient number, since it is larger than the sum of its proper divisors (1).

12657431489 is an equidigital number, since it uses as much as digits as its factorization.

12657431489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The spelling of 12657431489 in words is "twelve billion, six hundred fifty-seven million, four hundred thirty-one thousand, four hundred eighty-nine".