161728432493 has 2 divisors, whose sum is σ = 161728432494. Its totient is φ = 161728432492.

The previous prime is 161728432487. The next prime is 161728432499. The reversal of 161728432493 is 394234827161.

It is a balanced prime because it is at equal distance from previous prime (161728432487) and next prime (161728432499).

It can be written as a sum of positive squares in only one way, i.e., 147884086249 + 13844346244 = 384557^2 + 117662^2 .

It is a cyclic number.

It is not a de Polignac number, because 161728432493 - 2⁸ = 161728432237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161728432499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80864216246 + 80864216247.

It is an arithmetic number, because the mean of its divisors is an integer number (80864216247).

Almost surely, 2^161728432493 is an apocalyptic number.

It is an amenable number.

161728432493 is a deficient number, since it is larger than the sum of its proper divisors (1).

161728432493 is an equidigital number, since it uses as much as digits as its factorization.

161728432493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 50.

The spelling of 161728432493 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, four hundred thirty-two thousand, four hundred ninety-three".