161165610 has 48 divisors (see below), whose sum is σ = 443683656. Its totient is φ = 40449024.

The previous prime is 161165579. The next prime is 161165651. The reversal of 161165610 is 16561161.

161165610 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 656 + 1 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 161112249 + 53361 = 12693^2 + 231^2 .

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 51139 + ... + 54198.

Almost surely, 2^161165610 is an apocalyptic number.

161165610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161165610 is an abundant number, since it is smaller than the sum of its proper divisors (282518046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161165610 is a wasteful number, since it uses less digits than its factorization.

161165610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105367 (or 105364 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161165610 is about 12695.1018113287. The cubic root of 161165610 is about 544.1986483469.

The spelling of 161165610 in words is "one hundred sixty-one million, one hundred sixty-five thousand, six hundred ten".