165686562 has 48 divisors (see below), whose sum is σ = 369338112. Its totient is φ = 53654400.

The previous prime is 165686557. The next prime is 165686569. The reversal of 165686562 is 265686561.

It is a happy number.

165686562 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 86 + 562 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (165686569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127098 + ... + 128394.

It is an arithmetic number, because the mean of its divisors is an integer number (7694544).

Almost surely, 2^165686562 is an apocalyptic number.

165686562 is an abundant number, since it is smaller than the sum of its proper divisors (203651550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165686562 is a wasteful number, since it uses less digits than its factorization.

165686562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1500 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 165686562 is about 12871.9292260329. The cubic root of 165686562 is about 549.2403418795.

Subtracting 165686562 from its reverse (265686561), we obtain a palindrome (99999999).

The spelling of 165686562 in words is "one hundred sixty-five million, six hundred eighty-six thousand, five hundred sixty-two".