165928505 has 8 divisors (see below), whose sum is σ = 199225032. Its totient is φ = 132668928.

The previous prime is 165928493. The next prime is 165928547. The reversal of 165928505 is 505829561.

It can be written as a sum of positive squares in 4 ways, for example, as 79512889 + 86415616 = 8917^2 + 9296^2 .

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 165928505 - 2¹⁰ = 165927481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1859 + ... + 18311.

It is an arithmetic number, because the mean of its divisors is an integer number (24903129).

Almost surely, 2^165928505 is an apocalyptic number.

It is an amenable number.

165928505 is a deficient number, since it is larger than the sum of its proper divisors (33296527).

165928505 is a wasteful number, since it uses less digits than its factorization.

165928505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18475.

The product of its (nonzero) digits is 108000, while the sum is 41.

The square root of 165928505 is about 12881.3238838250. The cubic root of 165928505 is about 549.5075537068.

The spelling of 165928505 in words is "one hundred sixty-five million, nine hundred twenty-eight thousand, five hundred five".