161543889413 has 2 divisors, whose sum is σ = 161543889414. Its totient is φ = 161543889412.

The previous prime is 161543889407. The next prime is 161543889439. The reversal of 161543889413 is 314988345161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87928261729 + 73615627684 = 296527^2 + 271322^2 .

It is a cyclic number.

It is not a de Polignac number, because 161543889413 - 2¹² = 161543885317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161543889473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80771944706 + 80771944707.

It is an arithmetic number, because the mean of its divisors is an integer number (80771944707).

Almost surely, 2^161543889413 is an apocalyptic number.

It is an amenable number.

161543889413 is a deficient number, since it is larger than the sum of its proper divisors (1).

161543889413 is an equidigital number, since it uses as much as digits as its factorization.

161543889413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 53.

The spelling of 161543889413 in words is "one hundred sixty-one billion, five hundred forty-three million, eight hundred eighty-nine thousand, four hundred thirteen".