161765031223 has 2 divisors, whose sum is σ = 161765031224. Its totient is φ = 161765031222.

The previous prime is 161765031199. The next prime is 161765031229. The reversal of 161765031223 is 322130567161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161765031223 - 2⁹ = 161765030711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161765031229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80882515611 + 80882515612.

It is an arithmetic number, because the mean of its divisors is an integer number (80882515612).

Almost surely, 2^161765031223 is an apocalyptic number.

161765031223 is a deficient number, since it is larger than the sum of its proper divisors (1).

161765031223 is an equidigital number, since it uses as much as digits as its factorization.

161765031223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

Adding to 161765031223 its reverse (322130567161), we get a palindrome (483895598384).

The spelling of 161765031223 in words is "one hundred sixty-one billion, seven hundred sixty-five million, thirty-one thousand, two hundred twenty-three".