12135126227845 has 4 divisors (see below), whose sum is σ = 14562151473420. Its totient is φ = 9708100982272.

The previous prime is 12135126227831. The next prime is 12135126227891. The reversal of 12135126227845 is 54872262153121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7595017880836 + 4540108347009 = 2755906^2 + 2130753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12135126227845 is a prime.

It is a super-2 number, since 2×12135126227845² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213512622780 + ... + 1213512622789.

It is an arithmetic number, because the mean of its divisors is an integer number (3640537868355).

Almost surely, 2^{12135126227845} is an apocalyptic number.

It is an amenable number.

12135126227845 is a deficient number, since it is larger than the sum of its proper divisors (2427025245575).

12135126227845 is an equidigital number, since it uses as much as digits as its factorization.

12135126227845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427025245574.

The product of its digits is 1612800, while the sum is 49.

The spelling of 12135126227845 in words is "twelve trillion, one hundred thirty-five billion, one hundred twenty-six million, two hundred twenty-seven thousand, eight hundred forty-five".