12661424423 has 4 divisors (see below), whose sum is σ = 12930816480. Its totient is φ = 12392032368.

The previous prime is 12661424411. The next prime is 12661424429. The reversal of 12661424423 is 32442416621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12661424423 - 2⁶ = 12661424359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661424429) 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, 134695958 + ... + 134696051.

It is an arithmetic number, because the mean of its divisors is an integer number (3232704120).

Almost surely, 2^12661424423 is an apocalyptic number.

12661424423 is a deficient number, since it is larger than the sum of its proper divisors (269392057).

12661424423 is an equidigital number, since it uses as much as digits as its factorization.

12661424423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269392056.

The product of its digits is 55296, while the sum is 35.

The spelling of 12661424423 in words is "twelve billion, six hundred sixty-one million, four hundred twenty-four thousand, four hundred twenty-three".