165505610 has 32 divisors (see below), whose sum is σ = 309854160. Its totient is φ = 63572992.

The previous prime is 165505609. The next prime is 165505619. The reversal of 165505610 is 16505561.

It can be written as a sum of positive squares in 8 ways, for example, as 89624089 + 75881521 = 9467^2 + 8711^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (165505619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55682 + ... + 58578.

Almost surely, 2^165505610 is an apocalyptic number.

165505610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165505610 is a deficient number, since it is larger than the sum of its proper divisors (144348550).

165505610 is a wasteful number, since it uses less digits than its factorization.

165505610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 165505610 is about 12864.8983672628. The cubic root of 165505610 is about 549.0403209481.

The spelling of 165505610 in words is "one hundred sixty-five million, five hundred five thousand, six hundred ten".