165669442 has 16 divisors (see below), whose sum is σ = 251143992. Its totient is φ = 81959040.

The previous prime is 165669421. The next prime is 165669443. The reversal of 165669442 is 244966561.

It can be written as a sum of positive squares in 4 ways, for example, as 160047801 + 5621641 = 12651^2 + 2371^2 .

It is not an unprimeable number, because it can be changed into a prime (165669443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101392 + ... + 103012.

Almost surely, 2^165669442 is an apocalyptic number.

165669442 is a deficient number, since it is larger than the sum of its proper divisors (85474550).

165669442 is a wasteful number, since it uses less digits than its factorization.

165669442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133.

The product of its digits is 311040, while the sum is 43.

The square root of 165669442 is about 12871.2641958745. The cubic root of 165669442 is about 549.2214239934.

The spelling of 165669442 in words is "one hundred sixty-five million, six hundred sixty-nine thousand, four hundred forty-two".