12540275243 has 2 divisors, whose sum is σ = 12540275244. Its totient is φ = 12540275242.

The previous prime is 12540275221. The next prime is 12540275281. The reversal of 12540275243 is 34257204521.

It is a weak prime.

It is an emirp because it is prime and its reverse (34257204521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12540275243 is a prime.

It is not a weakly prime, because it can be changed into another prime (12540275203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270137621 + 6270137622.

It is an arithmetic number, because the mean of its divisors is an integer number (6270137622).

Almost surely, 2^12540275243 is an apocalyptic number.

12540275243 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540275243 is an equidigital number, since it uses as much as digits as its factorization.

12540275243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 35.

Adding to 12540275243 its reverse (34257204521), we get a palindrome (46797479764).

The spelling of 12540275243 in words is "twelve billion, five hundred forty million, two hundred seventy-five thousand, two hundred forty-three".