12878910845 has 4 divisors (see below), whose sum is σ = 15454693020. Its totient is φ = 10303128672.

The previous prime is 12878910839. The next prime is 12878910859. The reversal of 12878910845 is 54801987821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54801987821 = 7 ⋅7828855403.

It can be written as a sum of positive squares in 2 ways, for example, as 4387472644 + 8491438201 = 66238^2 + 92149^2 .

It is a cyclic number.

It is not a de Polignac number, because 12878910845 - 2¹² = 12878906749 is a prime.

It is a super-2 number, since 2×12878910845² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287891080 + ... + 1287891089.

It is an arithmetic number, because the mean of its divisors is an integer number (3863673255).

Almost surely, 2^12878910845 is an apocalyptic number.

It is an amenable number.

12878910845 is a deficient number, since it is larger than the sum of its proper divisors (2575782175).

12878910845 is an equidigital number, since it uses as much as digits as its factorization.

12878910845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575782174.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 12878910845 in words is "twelve billion, eight hundred seventy-eight million, nine hundred ten thousand, eight hundred forty-five".