12543249240077 has 2 divisors, whose sum is σ = 12543249240078. Its totient is φ = 12543249240076.

The previous prime is 12543249239921. The next prime is 12543249240083. The reversal of 12543249240077 is 77004294234521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12541131491716 + 2117748361 = 3541346^2 + 46019^2 .

It is an emirp because it is prime and its reverse (77004294234521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12543249240077 - 2¹⁶ = 12543249174541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12543249240097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271624620038 + 6271624620039.

It is an arithmetic number, because the mean of its divisors is an integer number (6271624620039).

Almost surely, 2^{12543249240077} is an apocalyptic number.

It is an amenable number.

12543249240077 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543249240077 is an equidigital number, since it uses as much as digits as its factorization.

12543249240077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 12543249240077 in words is "twelve trillion, five hundred forty-three billion, two hundred forty-nine million, two hundred forty thousand, seventy-seven".