12825515578 has 4 divisors (see below), whose sum is σ = 19238273370. Its totient is φ = 6412757788.

The previous prime is 12825515557. The next prime is 12825515623. The reversal of 12825515578 is 87551552821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87551552821 = 16189 ⋅5408089.

It can be written as a sum of positive squares in only one way, i.e., 6966072369 + 5859443209 = 83463^2 + 76547^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3206378893 + ... + 3206378896.

Almost surely, 2^12825515578 is an apocalyptic number.

12825515578 is a deficient number, since it is larger than the sum of its proper divisors (6412757792).

12825515578 is an equidigital number, since it uses as much as digits as its factorization.

12825515578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6412757791.

The product of its digits is 1120000, while the sum is 49.

The spelling of 12825515578 in words is "twelve billion, eight hundred twenty-five million, five hundred fifteen thousand, five hundred seventy-eight".