12166973509 has 2 divisors, whose sum is σ = 12166973510. Its totient is φ = 12166973508.

The previous prime is 12166973479. The next prime is 12166973587. The reversal of 12166973509 is 90537966121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11874460900 + 292512609 = 108970^2 + 17103^2 .

It is a cyclic number.

It is not a de Polignac number, because 12166973509 - 2³¹ = 10019489861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12166973009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6083486754 + 6083486755.

It is an arithmetic number, because the mean of its divisors is an integer number (6083486755).

Almost surely, 2^12166973509 is an apocalyptic number.

It is an amenable number.

12166973509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12166973509 is an equidigital number, since it uses as much as digits as its factorization.

12166973509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 49.

The spelling of 12166973509 in words is "twelve billion, one hundred sixty-six million, nine hundred seventy-three thousand, five hundred nine".