12540345427 has 2 divisors, whose sum is σ = 12540345428. Its totient is φ = 12540345426.

The previous prime is 12540345397. The next prime is 12540345431. The reversal of 12540345427 is 72454304521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12540345427 - 2⁷ = 12540345299 is a prime.

It is not a weakly prime, because it can be changed into another prime (12540345437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270172713 + 6270172714.

It is an arithmetic number, because the mean of its divisors is an integer number (6270172714).

Almost surely, 2^12540345427 is an apocalyptic number.

12540345427 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540345427 is an equidigital number, since it uses as much as digits as its factorization.

12540345427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 37.

Adding to 12540345427 its reverse (72454304521), we get a palindrome (84994649948).

The spelling of 12540345427 in words is "twelve billion, five hundred forty million, three hundred forty-five thousand, four hundred twenty-seven".