12166422465 has 16 divisors (see below), whose sum is σ = 19756819008. Its totient is φ = 6391910976.

The previous prime is 12166422439. The next prime is 12166422479. The reversal of 12166422465 is 56422466121.

It is not a de Polignac number, because 12166422465 - 2⁷ = 12166422337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6051942 + ... + 6053951.

It is an arithmetic number, because the mean of its divisors is an integer number (1234801188).

Almost surely, 2^12166422465 is an apocalyptic number.

12166422465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12166422465 is a deficient number, since it is larger than the sum of its proper divisors (7590396543).

12166422465 is a wasteful number, since it uses less digits than its factorization.

12166422465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12105968.

The product of its digits is 138240, while the sum is 39.

Adding to 12166422465 its reverse (56422466121), we get a palindrome (68588888586).

The spelling of 12166422465 in words is "twelve billion, one hundred sixty-six million, four hundred twenty-two thousand, four hundred sixty-five".