161728432487 has 2 divisors, whose sum is σ = 161728432488. Its totient is φ = 161728432486.

The previous prime is 161728432457. The next prime is 161728432493. The reversal of 161728432487 is 784234827161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161728432487 - 2¹⁴ = 161728416103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161728432457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80864216243 + 80864216244.

It is an arithmetic number, because the mean of its divisors is an integer number (80864216244).

Almost surely, 2^161728432487 is an apocalyptic number.

161728432487 is a deficient number, since it is larger than the sum of its proper divisors (1).

161728432487 is an equidigital number, since it uses as much as digits as its factorization.

161728432487 is an evil number, because the sum of its binary digits is even.

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

The spelling of 161728432487 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, four hundred thirty-two thousand, four hundred eighty-seven".