165125565 has 48 divisors (see below), whose sum is σ = 323032320. Its totient is φ = 77293440.

The previous prime is 165125537. The next prime is 165125567. The reversal of 165125565 is 565521561.

It is not a de Polignac number, because 165125565 - 2¹⁰ = 165124541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165125567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8604 + ... + 20106.

It is an arithmetic number, because the mean of its divisors is an integer number (6729840).

Almost surely, 2^165125565 is an apocalyptic number.

165125565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165125565 is a deficient number, since it is larger than the sum of its proper divisors (157906755).

165125565 is a wasteful number, since it uses less digits than its factorization.

165125565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11554 (or 11551 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 165125565 is about 12850.1192601470. The cubic root of 165125565 is about 548.6197512248.

The spelling of 165125565 in words is "one hundred sixty-five million, one hundred twenty-five thousand, five hundred sixty-five".