165688564 has 6 divisors (see below), whose sum is σ = 289954994. Its totient is φ = 82844280.

The previous prime is 165688561. The next prime is 165688577. The reversal of 165688564 is 465886561.

It can be written as a sum of positive squares in only one way, i.e., 101848464 + 63840100 = 10092^2 + 7990^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165688561) 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 as a sum of consecutive naturals, namely, 20711067 + ... + 20711074.

Almost surely, 2^165688564 is an apocalyptic number.

It is an amenable number.

165688564 is a deficient number, since it is larger than the sum of its proper divisors (124266430).

165688564 is a wasteful number, since it uses less digits than its factorization.

165688564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41422145 (or 41422143 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

The square root of 165688564 is about 12872.0069919185. The cubic root of 165688564 is about 549.2425540378.

The spelling of 165688564 in words is "one hundred sixty-five million, six hundred eighty-eight thousand, five hundred sixty-four".