165940525 has 6 divisors (see below), whose sum is σ = 205766282. Its totient is φ = 132752400.

The previous prime is 165940517. The next prime is 165940529. The reversal of 165940525 is 525049561.

It can be written as a sum of positive squares in 3 ways, for example, as 15976009 + 149964516 = 3997^2 + 12246^2 .

It is not a de Polignac number, because 165940525 - 2³ = 165940517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165940529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3318786 + ... + 3318835.

Almost surely, 2^165940525 is an apocalyptic number.

It is an amenable number.

165940525 is a deficient number, since it is larger than the sum of its proper divisors (39825757).

165940525 is an equidigital number, since it uses as much as digits as its factorization.

165940525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6637631 (or 6637626 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 165940525 is about 12881.7904423259. The cubic root of 165940525 is about 549.5208223157.

The spelling of 165940525 in words is "one hundred sixty-five million, nine hundred forty thousand, five hundred twenty-five".