12781796158025 has 6 divisors (see below), whose sum is σ = 15849427235982. Its totient is φ = 10225436926400.

The previous prime is 12781796157979. The next prime is 12781796158037. The reversal of 12781796158025 is 52085169718721.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 715815831481 + 12065980326544 = 846059^2 + 3473612^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12781796158025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255635923136 + ... + 255635923185.

It is an arithmetic number, because the mean of its divisors is an integer number (2641571205997).

Almost surely, 2^{12781796158025} is an apocalyptic number.

It is an amenable number.

12781796158025 is a deficient number, since it is larger than the sum of its proper divisors (3067631077957).

12781796158025 is an equidigital number, since it uses as much as digits as its factorization.

12781796158025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511271846331 (or 511271846326 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 62.

The spelling of 12781796158025 in words is "twelve trillion, seven hundred eighty-one billion, seven hundred ninety-six million, one hundred fifty-eight thousand, twenty-five".