12128847667 has 4 divisors (see below), whose sum is σ = 12130329456. Its totient is φ = 12127365880.

The previous prime is 12128847631. The next prime is 12128847713. The reversal of 12128847667 is 76674882121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76674882121 = 23 ⋅3333690527.

It is a cyclic number.

It is not a de Polignac number, because 12128847667 - 2⁷ = 12128847539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12128847167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728548 + ... + 745009.

It is an arithmetic number, because the mean of its divisors is an integer number (3032582364).

Almost surely, 2^12128847667 is an apocalyptic number.

12128847667 is a deficient number, since it is larger than the sum of its proper divisors (1481789).

12128847667 is an equidigital number, since it uses as much as digits as its factorization.

12128847667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481788.

The product of its digits is 1806336, while the sum is 52.

The spelling of 12128847667 in words is "twelve billion, one hundred twenty-eight million, eight hundred forty-seven thousand, six hundred sixty-seven".