165520616 has 8 divisors (see below), whose sum is σ = 310351170. Its totient is φ = 82760304.

The previous prime is 165520601. The next prime is 165520639. The reversal of 165520616 is 616025561.

It can be written as a sum of positive squares in only one way, i.e., 162664516 + 2856100 = 12754^2 + 1690^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10345031 + ... + 10345046.

Almost surely, 2^165520616 is an apocalyptic number.

It is an amenable number.

165520616 is a deficient number, since it is larger than the sum of its proper divisors (144830554).

165520616 is a wasteful number, since it uses less digits than its factorization.

165520616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20690083 (or 20690079 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 165520616 is about 12865.4815689114. The cubic root of 165520616 is about 549.0569138400.

The spelling of 165520616 in words is "one hundred sixty-five million, five hundred twenty thousand, six hundred sixteen".