165501601 has 16 divisors (see below), whose sum is σ = 171864000. Its totient is φ = 159307200.

The previous prime is 165501599. The next prime is 165501607. The reversal of 165501601 is 106105561.

It is a cyclic number.

It is not a de Polignac number, because 165501601 - 2¹ = 165501599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165501607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1110675 + ... + 1110823.

It is an arithmetic number, because the mean of its divisors is an integer number (10741500).

Almost surely, 2^165501601 is an apocalyptic number.

It is an amenable number.

165501601 is a deficient number, since it is larger than the sum of its proper divisors (6362399).

165501601 is a wasteful number, since it uses less digits than its factorization.

165501601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 165501601 is about 12864.7425547502. The cubic root of 165501601 is about 549.0358878247.

The spelling of 165501601 in words is "one hundred sixty-five million, five hundred one thousand, six hundred one".