161341050721 has 2 divisors, whose sum is σ = 161341050722. Its totient is φ = 161341050720.

The previous prime is 161341050707. The next prime is 161341050791. The reversal of 161341050721 is 127050143161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109984426321 + 51356624400 = 331639^2 + 226620^2 .

It is a cyclic number.

It is not a de Polignac number, because 161341050721 - 2²⁷ = 161206832993 is a prime.

It is not a weakly prime, because it can be changed into another prime (161341050701) 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 as a sum of consecutive naturals, namely, 80670525360 + 80670525361.

It is an arithmetic number, because the mean of its divisors is an integer number (80670525361).

Almost surely, 2^161341050721 is an apocalyptic number.

It is an amenable number.

161341050721 is a deficient number, since it is larger than the sum of its proper divisors (1).

161341050721 is an equidigital number, since it uses as much as digits as its factorization.

161341050721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 161341050721 its reverse (127050143161), we get a palindrome (288391193882).

The spelling of 161341050721 in words is "one hundred sixty-one billion, three hundred forty-one million, fifty thousand, seven hundred twenty-one".