161996210 has 8 divisors (see below), whose sum is σ = 291593196. Its totient is φ = 64798480.

The previous prime is 161996201. The next prime is 161996221. The reversal of 161996210 is 12699161.

161996210 is digitally balanced in base 3, 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 2 ways, for example, as 153487321 + 8508889 = 12389^2 + 2917^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 8099801 + ... + 8099820.

Almost surely, 2^161996210 is an apocalyptic number.

161996210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161996210 is a deficient number, since it is larger than the sum of its proper divisors (129596986).

161996210 is a wasteful number, since it uses less digits than its factorization.

161996210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16199628.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 161996210 is about 12727.7731752259. The cubic root of 161996210 is about 545.1319266516.

The spelling of 161996210 in words is "one hundred sixty-one million, nine hundred ninety-six thousand, two hundred ten".