161304223037 has 2 divisors, whose sum is σ = 161304223038. Its totient is φ = 161304223036.

The previous prime is 161304223009. The next prime is 161304223103. The reversal of 161304223037 is 730322403161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117631164676 + 43673058361 = 342974^2 + 208981^2 .

It is a cyclic number.

It is not a de Polignac number, because 161304223037 - 2²² = 161300028733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161304222994 and 161304223012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161304223337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80652111518 + 80652111519.

It is an arithmetic number, because the mean of its divisors is an integer number (80652111519).

Almost surely, 2^161304223037 is an apocalyptic number.

It is an amenable number.

161304223037 is a deficient number, since it is larger than the sum of its proper divisors (1).

161304223037 is an equidigital number, since it uses as much as digits as its factorization.

161304223037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

Adding to 161304223037 its reverse (730322403161), we get a palindrome (891626626198).

The spelling of 161304223037 in words is "one hundred sixty-one billion, three hundred four million, two hundred twenty-three thousand, thirty-seven".