161304223133 has 2 divisors, whose sum is σ = 161304223134. Its totient is φ = 161304223132.

The previous prime is 161304223127. The next prime is 161304223153. The reversal of 161304223133 is 331322403161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108424001284 + 52880221849 = 329278^2 + 229957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161304223133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161304223096 and 161304223105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161304223103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80652111566 + 80652111567.

It is an arithmetic number, because the mean of its divisors is an integer number (80652111567).

Almost surely, 2^161304223133 is an apocalyptic number.

It is an amenable number.

161304223133 is a deficient number, since it is larger than the sum of its proper divisors (1).

161304223133 is an equidigital number, since it uses as much as digits as its factorization.

161304223133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 161304223133 its reverse (331322403161), we get a palindrome (492626626294).

The spelling of 161304223133 in words is "one hundred sixty-one billion, three hundred four million, two hundred twenty-three thousand, one hundred thirty-three".