161882605 has 8 divisors (see below), whose sum is σ = 194330232. Its totient is φ = 129458688.

The previous prime is 161882563. The next prime is 161882629. The reversal of 161882605 is 506288161.

161882605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3575881 + 158306724 = 1891^2 + 12582^2 .

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 161882605 - 2¹³ = 161874413 is a prime.

It is a Duffinian 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, 17577 + ... + 25153.

It is an arithmetic number, because the mean of its divisors is an integer number (24291279).

Almost surely, 2^161882605 is an apocalyptic number.

It is an amenable number.

161882605 is a deficient number, since it is larger than the sum of its proper divisors (32447627).

161882605 is an equidigital number, since it uses as much as digits as its factorization.

161882605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11855.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 161882605 is about 12723.3095144306. The cubic root of 161882605 is about 545.0044664786.

The spelling of 161882605 in words is "one hundred sixty-one million, eight hundred eighty-two thousand, six hundred five".