161600503 has 2 divisors, whose sum is σ = 161600504. Its totient is φ = 161600502.

The previous prime is 161600501. The next prime is 161600531. The reversal of 161600503 is 305006161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161600503 - 2¹ = 161600501 is a prime.

It is a super-2 number, since 2×161600503² = 52229445139706018, which contains 22 as substring.

Together with 161600501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161600501) by changing a digit.

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 as a sum of consecutive naturals, namely, 80800251 + 80800252.

It is an arithmetic number, because the mean of its divisors is an integer number (80800252).

Almost surely, 2^161600503 is an apocalyptic number.

161600503 is a deficient number, since it is larger than the sum of its proper divisors (1).

161600503 is an equidigital number, since it uses as much as digits as its factorization.

161600503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 161600503 is about 12712.2186497873. The cubic root of 161600503 is about 544.6877014486.

Adding to 161600503 its reverse (305006161), we get a palindrome (466606664).

The spelling of 161600503 in words is "one hundred sixty-one million, six hundred thousand, five hundred three".