165149568 has 144 divisors (see below), whose sum is σ = 498629040. Its totient is φ = 52462080.

The previous prime is 165149531. The next prime is 165149597. The reversal of 165149568 is 865941561.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 609273 + ... + 609543.

Almost surely, 2^165149568 is an apocalyptic number.

165149568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165149568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249314520).

165149568 is an abundant number, since it is smaller than the sum of its proper divisors (333479472).

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

165149568 is a wasteful number, since it uses less digits than its factorization.

165149568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 299 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 165149568 is about 12851.0531864124. The cubic root of 165149568 is about 548.6463327778.

The spelling of 165149568 in words is "one hundred sixty-five million, one hundred forty-nine thousand, five hundred sixty-eight".