161720050 has 24 divisors (see below), whose sum is σ = 301199472. Its totient is φ = 64602000.

The previous prime is 161720047. The next prime is 161720071. The reversal of 161720050 is 50027161.

161720050 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46885 + ... + 50215.

It is an arithmetic number, because the mean of its divisors is an integer number (12549978).

Almost surely, 2^161720050 is an apocalyptic number.

161720050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161720050 is a deficient number, since it is larger than the sum of its proper divisors (139479422).

161720050 is a wasteful number, since it uses less digits than its factorization.

161720050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314 (or 4309 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 161720050 is about 12716.9198314686. The cubic root of 161720050 is about 544.8219826526.

The spelling of 161720050 in words is "one hundred sixty-one million, seven hundred twenty thousand, fifty".