12321664465 has 16 divisors (see below), whose sum is σ = 16140332160. Its totient is φ = 8955569920.

The previous prime is 12321664451. The next prime is 12321664499. The reversal of 12321664465 is 56446612321.

It is not a de Polignac number, because 12321664465 - 2¹¹ = 12321662417 is a prime.

It is a super-4 number, since 4×12321664465⁴ (a number of 41 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18681 + ... + 158089.

It is an arithmetic number, because the mean of its divisors is an integer number (1008770760).

Almost surely, 2^12321664465 is an apocalyptic number.

It is an amenable number.

12321664465 is a deficient number, since it is larger than the sum of its proper divisors (3818667695).

12321664465 is a wasteful number, since it uses less digits than its factorization.

12321664465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141032.

The product of its digits is 207360, while the sum is 40.

The spelling of 12321664465 in words is "twelve billion, three hundred twenty-one million, six hundred sixty-four thousand, four hundred sixty-five".