12543521629 has 2 divisors, whose sum is σ = 12543521630. Its totient is φ = 12543521628.

The previous prime is 12543521623. The next prime is 12543521651. The reversal of 12543521629 is 92612534521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12471305625 + 72216004 = 111675^2 + 8498^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543521629 - 2⁹ = 12543521117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12543521591 and 12543521600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12543521623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271760814 + 6271760815.

It is an arithmetic number, because the mean of its divisors is an integer number (6271760815).

Almost surely, 2^12543521629 is an apocalyptic number.

It is an amenable number.

12543521629 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543521629 is an equidigital number, since it uses as much as digits as its factorization.

12543521629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The spelling of 12543521629 in words is "twelve billion, five hundred forty-three million, five hundred twenty-one thousand, six hundred twenty-nine".