161409396769 has 2 divisors, whose sum is σ = 161409396770. Its totient is φ = 161409396768.

The previous prime is 161409396767. The next prime is 161409396779. The reversal of 161409396769 is 967693904161.

161409396769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85626464400 + 75782932369 = 292620^2 + 275287^2 .

It is a cyclic number.

It is not a de Polignac number, because 161409396769 - 2¹ = 161409396767 is a prime.

It is a super-2 number, since 2×161409396769² (a number of 23 digits) contains 22 as substring.

Together with 161409396767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161409396767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80704698384 + 80704698385.

It is an arithmetic number, because the mean of its divisors is an integer number (80704698385).

Almost surely, 2^161409396769 is an apocalyptic number.

It is an amenable number.

161409396769 is a deficient number, since it is larger than the sum of its proper divisors (1).

161409396769 is an equidigital number, since it uses as much as digits as its factorization.

161409396769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 61.

The spelling of 161409396769 in words is "one hundred sixty-one billion, four hundred nine million, three hundred ninety-six thousand, seven hundred sixty-nine".