1265532165 has 24 divisors (see below), whose sum is σ = 2199406560. Its totient is φ = 673160544.

The previous prime is 1265532143. The next prime is 1265532167. The reversal of 1265532165 is 5612355621.

1265532165 is a `hidden beast` number, since 1 + 2 + 65 + 532 + 1 + 65 = 666.

It is not a de Polignac number, because 1265532165 - 2⁵ = 1265532133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265532167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20047 + ... + 54156.

It is an arithmetic number, because the mean of its divisors is an integer number (91641940).

Almost surely, 2^1265532165 is an apocalyptic number.

1265532165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265532165 is a deficient number, since it is larger than the sum of its proper divisors (933874395).

1265532165 is a wasteful number, since it uses less digits than its factorization.

1265532165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74593 (or 74590 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 1265532165 is about 35574.3188972045. The cubic root of 1265532165 is about 1081.6607294318.

Adding to 1265532165 its reverse (5612355621), we get a palindrome (6877887786).

The spelling of 1265532165 in words is "one billion, two hundred sixty-five million, five hundred thirty-two thousand, one hundred sixty-five".