12165534465 has 32 divisors (see below), whose sum is σ = 22293273600. Its totient is φ = 5549456064.

The previous prime is 12165534443. The next prime is 12165534467. The reversal of 12165534465 is 56443556121.

It is not a de Polignac number, because 12165534465 - 2¹⁰ = 12165533441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12165534467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75015 + ... + 173084.

It is an arithmetic number, because the mean of its divisors is an integer number (696664800).

Almost surely, 2^12165534465 is an apocalyptic number.

12165534465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12165534465 is a deficient number, since it is larger than the sum of its proper divisors (10127739135).

12165534465 is a wasteful number, since it uses less digits than its factorization.

12165534465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248581.

The product of its digits is 432000, while the sum is 42.

The spelling of 12165534465 in words is "twelve billion, one hundred sixty-five million, five hundred thirty-four thousand, four hundred sixty-five".