165549668 has 6 divisors (see below), whose sum is σ = 289711926. Its totient is φ = 82774832.

The previous prime is 165549649. The next prime is 165549673. The reversal of 165549668 is 866945561.

It is a happy number.

165549668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 152819044 + 12730624 = 12362^2 + 3568^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20693705 + ... + 20693712.

It is an arithmetic number, because the mean of its divisors is an integer number (48285321).

Almost surely, 2^165549668 is an apocalyptic number.

It is an amenable number.

165549668 is a deficient number, since it is larger than the sum of its proper divisors (124162258).

165549668 is a wasteful number, since it uses less digits than its factorization.

165549668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41387421 (or 41387419 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

The square root of 165549668 is about 12866.6105870971. The cubic root of 165549668 is about 549.0890352532.

The spelling of 165549668 in words is "one hundred sixty-five million, five hundred forty-nine thousand, six hundred sixty-eight".