12423653549 has 2 divisors, whose sum is σ = 12423653550. Its totient is φ = 12423653548.

The previous prime is 12423653531. The next prime is 12423653551. The reversal of 12423653549 is 94535632421.

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., 11653202500 + 770451049 = 107950^2 + 27757^2 .

It is a cyclic number.

It is not a de Polignac number, because 12423653549 - 2²⁴ = 12406876333 is a prime.

Together with 12423653551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12423653579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6211826774 + 6211826775.

It is an arithmetic number, because the mean of its divisors is an integer number (6211826775).

Almost surely, 2^12423653549 is an apocalyptic number.

It is an amenable number.

12423653549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12423653549 is an equidigital number, since it uses as much as digits as its factorization.

12423653549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 44.

The spelling of 12423653549 in words is "twelve billion, four hundred twenty-three million, six hundred fifty-three thousand, five hundred forty-nine".