165117605 has 8 divisors (see below), whose sum is σ = 200855832. Its totient is φ = 130284288.

The previous prime is 165117599. The next prime is 165117613. The reversal of 165117605 is 506711561.

It can be written as a sum of positive squares in 4 ways, for example, as 21141604 + 143976001 = 4598^2 + 11999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165117605 - 2⁸ = 165117349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225824 + ... + 226553.

It is an arithmetic number, because the mean of its divisors is an integer number (25106979).

Almost surely, 2^165117605 is an apocalyptic number.

It is an amenable number.

165117605 is a deficient number, since it is larger than the sum of its proper divisors (35738227).

165117605 is an equidigital number, since it uses as much as digits as its factorization.

165117605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452455.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 165117605 is about 12849.8095316623. The cubic root of 165117605 is about 548.6109355428.

The spelling of 165117605 in words is "one hundred sixty-five million, one hundred seventeen thousand, six hundred five".