12879162891389 has 4 divisors (see below), whose sum is σ = 12879190138524. Its totient is φ = 12879135644256.

The previous prime is 12879162891383. The next prime is 12879162891391. The reversal of 12879162891389 is 98319826197821.

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 767127236164 + 12112035655225 = 875858^2 + 3480235^2 .

It is a cyclic number.

It is not a de Polignac number, because 12879162891389 - 2¹² = 12879162887293 is a prime.

It is a super-2 number, since 2×12879162891389² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12879162891383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12901802 + ... + 13864155.

It is an arithmetic number, because the mean of its divisors is an integer number (3219797534631).

Almost surely, 2^{12879162891389} is an apocalyptic number.

It is an amenable number.

12879162891389 is a deficient number, since it is larger than the sum of its proper divisors (27247135).

12879162891389 is an equidigital number, since it uses as much as digits as its factorization.

12879162891389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27247134.

The product of its digits is 188116992, while the sum is 74.

The spelling of 12879162891389 in words is "twelve trillion, eight hundred seventy-nine billion, one hundred sixty-two million, eight hundred ninety-one thousand, three hundred eighty-nine".