161765031229 has 2 divisors, whose sum is σ = 161765031230. Its totient is φ = 161765031228.

The previous prime is 161765031223. The next prime is 161765031251. The reversal of 161765031229 is 922130567161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130391765604 + 31373265625 = 361098^2 + 177125^2 .

It is a cyclic number.

It is not a de Polignac number, because 161765031229 - 2⁹ = 161765030717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161765031223) 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, 80882515614 + 80882515615.

It is an arithmetic number, because the mean of its divisors is an integer number (80882515615).

Almost surely, 2^161765031229 is an apocalyptic number.

It is an amenable number.

161765031229 is a deficient number, since it is larger than the sum of its proper divisors (1).

161765031229 is an equidigital number, since it uses as much as digits as its factorization.

161765031229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

It can be divided in two parts, 16176 and 5031229, that added together give a palindrome (5047405).

The spelling of 161765031229 in words is "one hundred sixty-one billion, seven hundred sixty-five million, thirty-one thousand, two hundred twenty-nine".