165566925 has 18 divisors (see below), whose sum is σ = 296549162. Its totient is φ = 88302240.

The previous prime is 165566923. The next prime is 165566941. The reversal of 165566925 is 529665561.

165566925 is a `hidden beast` number, since 1 + 6 + 556 + 6 + 92 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 161604 + 165405321 = 402^2 + 12861^2 .

It is not a de Polignac number, because 165566925 - 2¹ = 165566923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165566923) 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 17 ways as a sum of consecutive naturals, for example, 367702 + ... + 368151.

Almost surely, 2^165566925 is an apocalyptic number.

165566925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165566925 is a deficient number, since it is larger than the sum of its proper divisors (130982237).

165566925 is a wasteful number, since it uses less digits than its factorization.

165566925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735869 (or 735861 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The square root of 165566925 is about 12867.2811813530. The cubic root of 165566925 is about 549.1081137174.

The spelling of 165566925 in words is "one hundred sixty-five million, five hundred sixty-six thousand, nine hundred twenty-five".