12189926465 has 8 divisors (see below), whose sum is σ = 14778715560. Its totient is φ = 9651405312.

The previous prime is 12189926459. The next prime is 12189926491. The reversal of 12189926465 is 56462998121.

It is a Cunningham number, because it is equal to 110408²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 12189926464 = 1^2 + 110408^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12189926465 - 2⁸ = 12189926209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12566450 + ... + 12567419.

It is an arithmetic number, because the mean of its divisors is an integer number (1847339445).

Almost surely, 2^12189926465 is an apocalyptic number.

It is an amenable number.

12189926465 is a deficient number, since it is larger than the sum of its proper divisors (2588789095).

12189926465 is an equidigital number, since it uses as much as digits as its factorization.

12189926465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25133971.

The product of its digits is 1866240, while the sum is 53.

The spelling of 12189926465 in words is "twelve billion, one hundred eighty-nine million, nine hundred twenty-six thousand, four hundred sixty-five".