165663041 has 4 divisors (see below), whose sum is σ = 166089300. Its totient is φ = 165236784.

The previous prime is 165663031. The next prime is 165663077. The reversal of 165663041 is 140366561.

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 39325441 + 126337600 = 6271^2 + 11240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165663041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165662989 and 165663007.

It is not an unprimeable number, because it can be changed into a prime (165663031) 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, 212546 + ... + 213323.

It is an arithmetic number, because the mean of its divisors is an integer number (41522325).

Almost surely, 2^165663041 is an apocalyptic number.

It is an amenable number.

165663041 is a deficient number, since it is larger than the sum of its proper divisors (426259).

165663041 is an equidigital number, since it uses as much as digits as its factorization.

165663041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426258.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 165663041 is about 12871.0155387988. The cubic root of 165663041 is about 549.2143504466.

The spelling of 165663041 in words is "one hundred sixty-five million, six hundred sixty-three thousand, forty-one".