12171667279 has 2 divisors, whose sum is σ = 12171667280. Its totient is φ = 12171667278.

The previous prime is 12171667271. The next prime is 12171667283. The reversal of 12171667279 is 97276617121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12171667279 - 2³ = 12171667271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12171667271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6085833639 + 6085833640.

It is an arithmetic number, because the mean of its divisors is an integer number (6085833640).

Almost surely, 2^12171667279 is an apocalyptic number.

12171667279 is a deficient number, since it is larger than the sum of its proper divisors (1).

12171667279 is an equidigital number, since it uses as much as digits as its factorization.

12171667279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 49.

The spelling of 12171667279 in words is "twelve billion, one hundred seventy-one million, six hundred sixty-seven thousand, two hundred seventy-nine".