12172279423 has 2 divisors, whose sum is σ = 12172279424. Its totient is φ = 12172279422.

The previous prime is 12172279421. The next prime is 12172279477. The reversal of 12172279423 is 32497227121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12172279423 - 2¹ = 12172279421 is a prime.

Together with 12172279421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12172279421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6086139711 + 6086139712.

It is an arithmetic number, because the mean of its divisors is an integer number (6086139712).

Almost surely, 2^12172279423 is an apocalyptic number.

12172279423 is a deficient number, since it is larger than the sum of its proper divisors (1).

12172279423 is an equidigital number, since it uses as much as digits as its factorization.

12172279423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The spelling of 12172279423 in words is "twelve billion, one hundred seventy-two million, two hundred seventy-nine thousand, four hundred twenty-three".