165888001 has 4 divisors (see below), whose sum is σ = 166000900. Its totient is φ = 165775104.

The previous prime is 165887977. The next prime is 165888011. The reversal of 165888001 is 100888561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100888561 = 227 ⋅444443.

It can be written as a sum of positive squares in 2 ways, for example, as 51825601 + 114062400 = 7199^2 + 10680^2 .

It is a cyclic number.

It is not a de Polignac number, because 165888001 - 2⁷ = 165887873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165888011) 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, 54216 + ... + 57193.

It is an arithmetic number, because the mean of its divisors is an integer number (41500225).

It is a Proth number, since it is equal to 10125 ⋅ 2¹⁴ + 1 and 10125 < 2¹⁴.

Almost surely, 2^165888001 is an apocalyptic number.

It is an amenable number.

165888001 is a deficient number, since it is larger than the sum of its proper divisors (112899).

165888001 is a wasteful number, since it uses less digits than its factorization.

165888001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112898.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 165888001 is about 12879.7515892194. The cubic root of 165888001 is about 549.4628375297.

The spelling of 165888001 in words is "one hundred sixty-five million, eight hundred eighty-eight thousand, one".