12145133437 has 4 divisors (see below), whose sum is σ = 12147826716. Its totient is φ = 12142440160.

The previous prime is 12145133389. The next prime is 12145133471. The reversal of 12145133437 is 73433154121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73433154121 = 1889 ⋅38874089.

It can be written as a sum of positive squares in 2 ways, for example, as 4538851641 + 7606281796 = 67371^2 + 87214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12145133437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145133137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339864 + ... + 1348897.

It is an arithmetic number, because the mean of its divisors is an integer number (3036956679).

Almost surely, 2^12145133437 is an apocalyptic number.

It is an amenable number.

12145133437 is a deficient number, since it is larger than the sum of its proper divisors (2693279).

12145133437 is an equidigital number, since it uses as much as digits as its factorization.

12145133437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693278.

The product of its digits is 30240, while the sum is 34.

Adding to 12145133437 its reverse (73433154121), we get a palindrome (85578287558).

The spelling of 12145133437 in words is "twelve billion, one hundred forty-five million, one hundred thirty-three thousand, four hundred thirty-seven".