165666544 has 20 divisors (see below), whose sum is σ = 323137800. Its totient is φ = 82276160.

The previous prime is 165666541. The next prime is 165666551. The reversal of 165666544 is 445666561.

It is a self number, because there is not a number n which added to its sum of digits gives 165666544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165666541) 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 3 ways as a sum of consecutive naturals, for example, 32362 + ... + 37129.

It is an arithmetic number, because the mean of its divisors is an integer number (16156890).

Almost surely, 2^165666544 is an apocalyptic number.

It is an amenable number.

165666544 is a deficient number, since it is larger than the sum of its proper divisors (157471256).

165666544 is a wasteful number, since it uses less digits than its factorization.

165666544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69648 (or 69642 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The square root of 165666544 is about 12871.1516190277. The cubic root of 165666544 is about 549.2182215259.

The spelling of 165666544 in words is "one hundred sixty-five million, six hundred sixty-six thousand, five hundred forty-four".