161330803 has 4 divisors (see below), whose sum is σ = 163540888. Its totient is φ = 159120720.

The previous prime is 161330801. The next prime is 161330821. The reversal of 161330803 is 308033161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161330803 - 2¹ = 161330801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161330801) 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 in 3 ways as a sum of consecutive naturals, for example, 1104933 + ... + 1105078.

It is an arithmetic number, because the mean of its divisors is an integer number (40885222).

Almost surely, 2^161330803 is an apocalyptic number.

161330803 is a deficient number, since it is larger than the sum of its proper divisors (2210085).

161330803 is an equidigital number, since it uses as much as digits as its factorization.

161330803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210084.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 161330803 is about 12701.6063157382. The cubic root of 161330803 is about 544.3845174249.

Adding to 161330803 its reverse (308033161), we get a palindrome (469363964).

The spelling of 161330803 in words is "one hundred sixty-one million, three hundred thirty thousand, eight hundred three".