165050661 has 4 divisors (see below), whose sum is σ = 220067552. Its totient is φ = 110033772.

The previous prime is 165050657. The next prime is 165050693. The reversal of 165050661 is 166050561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165050661 - 2² = 165050657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165050621) 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, 27508441 + ... + 27508446.

It is an arithmetic number, because the mean of its divisors is an integer number (55016888).

Almost surely, 2^165050661 is an apocalyptic number.

It is an amenable number.

165050661 is a deficient number, since it is larger than the sum of its proper divisors (55016891).

165050661 is an equidigital number, since it uses as much as digits as its factorization.

165050661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55016890.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 165050661 is about 12847.2044040717. The cubic root of 165050661 is about 548.5367840011.

The spelling of 165050661 in words is "one hundred sixty-five million, fifty thousand, six hundred sixty-one".