161728432373 has 2 divisors, whose sum is σ = 161728432374. Its totient is φ = 161728432372.

The previous prime is 161728432301. The next prime is 161728432457. The reversal of 161728432373 is 373234827161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145257790129 + 16470642244 = 381127^2 + 128338^2 .

It is a cyclic number.

It is not a de Polignac number, because 161728432373 - 2³⁰ = 160654690549 is a prime.

It is a super-2 number, since 2×161728432373² (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 (161728435373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80864216186 + 80864216187.

It is an arithmetic number, because the mean of its divisors is an integer number (80864216187).

Almost surely, 2^161728432373 is an apocalyptic number.

It is an amenable number.

161728432373 is a deficient number, since it is larger than the sum of its proper divisors (1).

161728432373 is an equidigital number, since it uses as much as digits as its factorization.

161728432373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 47.

The spelling of 161728432373 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, four hundred thirty-two thousand, three hundred seventy-three".