165223505 has 8 divisors (see below), whose sum is σ = 198450600. Its totient is φ = 132057216.

The previous prime is 165223489. The next prime is 165223517. The reversal of 165223505 is 505322561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3323329 + 161900176 = 1823^2 + 12724^2 .

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 165223505 - 2⁴ = 165223489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8990 + ... + 20279.

It is an arithmetic number, because the mean of its divisors is an integer number (24806325).

Almost surely, 2^165223505 is an apocalyptic number.

It is an amenable number.

165223505 is a deficient number, since it is larger than the sum of its proper divisors (33227095).

165223505 is a wasteful number, since it uses less digits than its factorization.

165223505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30403.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 165223505 is about 12853.9295548093. The cubic root of 165223505 is about 548.7281963722.

The spelling of 165223505 in words is "one hundred sixty-five million, two hundred twenty-three thousand, five hundred five".