16500161 has 2 divisors, whose sum is σ = 16500162. Its totient is φ = 16500160.

The previous prime is 16500139. The next prime is 16500173. The reversal of 16500161 is 16100561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12559936 + 3940225 = 3544^2 + 1985^2 .

It is an emirp because it is prime and its reverse (16100561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16500161 - 2⁶ = 16500097 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16500181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250080 + 8250081.

It is an arithmetic number, because the mean of its divisors is an integer number (8250081).

Almost surely, 2^16500161 is an apocalyptic number.

It is an amenable number.

16500161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16500161 is an equidigital number, since it uses as much as digits as its factorization.

16500161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 16500161 is about 4062.0390199997. The cubic root of 16500161 is about 254.5829965152.

It can be divided in two parts, 16500 and 161, that added together give a palindrome (16661).

The spelling of 16500161 in words is "sixteen million, five hundred thousand, one hundred sixty-one".