161966215 has 8 divisors (see below), whose sum is σ = 194434848. Its totient is φ = 129522720.

The previous prime is 161966209. The next prime is 161966249. The reversal of 161966215 is 512669161.

161966215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161966215 - 2¹¹ = 161964167 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, 13645 + ... + 22585.

It is an arithmetic number, because the mean of its divisors is an integer number (24304356).

Almost surely, 2^161966215 is an apocalyptic number.

161966215 is a deficient number, since it is larger than the sum of its proper divisors (32468633).

161966215 is an equidigital number, since it uses as much as digits as its factorization.

161966215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12569.

The product of its digits is 19440, while the sum is 37.

The square root of 161966215 is about 12726.5947920094. The cubic root of 161966215 is about 545.0982792771.

The spelling of 161966215 in words is "one hundred sixty-one million, nine hundred sixty-six thousand, two hundred fifteen".