161728432847 has 2 divisors, whose sum is σ = 161728432848. Its totient is φ = 161728432846.

The previous prime is 161728432837. The next prime is 161728432883. The reversal of 161728432847 is 748234827161.

It is a happy number.

161728432847 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 is a cyclic number.

It is not a de Polignac number, because 161728432847 - 2¹² = 161728428751 is a prime.

It is a super-2 number, since 2×161728432847² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161728432837) 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, 80864216423 + 80864216424.

It is an arithmetic number, because the mean of its divisors is an integer number (80864216424).

Almost surely, 2^161728432847 is an apocalyptic number.

161728432847 is a deficient number, since it is larger than the sum of its proper divisors (1).

161728432847 is an equidigital number, since it uses as much as digits as its factorization.

161728432847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 53.

The spelling of 161728432847 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, four hundred thirty-two thousand, eight hundred forty-seven".