165061601 has 4 divisors (see below), whose sum is σ = 165173652. Its totient is φ = 164949552.

The previous prime is 165061571. The next prime is 165061651. The reversal of 165061601 is 106160561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71842576 + 93219025 = 8476^2 + 9655^2 .

It is a cyclic number.

It is not a de Polignac number, because 165061601 - 2²⁶ = 97952737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165061651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53786 + ... + 56771.

It is an arithmetic number, because the mean of its divisors is an integer number (41293413).

Almost surely, 2^165061601 is an apocalyptic number.

It is an amenable number.

165061601 is a deficient number, since it is larger than the sum of its proper divisors (112051).

165061601 is a wasteful number, since it uses less digits than its factorization.

165061601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112050.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 165061601 is about 12847.6301705801. The cubic root of 165061601 is about 548.5489032292.

The spelling of 165061601 in words is "one hundred sixty-five million, sixty-one thousand, six hundred one".