12565506165 has 32 divisors (see below), whose sum is σ = 21425319936. Its totient is φ = 6273833280.

The previous prime is 12565506091. The next prime is 12565506167. The reversal of 12565506165 is 56160556521.

It is not a de Polignac number, because 12565506165 - 2⁹ = 12565505653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12565506167) 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, 371251 + ... + 403680.

It is an arithmetic number, because the mean of its divisors is an integer number (669541248).

Almost surely, 2^12565506165 is an apocalyptic number.

12565506165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12565506165 is a deficient number, since it is larger than the sum of its proper divisors (8859813771).

12565506165 is a wasteful number, since it uses less digits than its factorization.

12565506165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775009.

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 12565506165 in words is "twelve billion, five hundred sixty-five million, five hundred six thousand, one hundred sixty-five".