161304460409 has 2 divisors, whose sum is σ = 161304460410. Its totient is φ = 161304460408.

The previous prime is 161304460399. The next prime is 161304460463. The reversal of 161304460409 is 904064403161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148800748009 + 12503712400 = 385747^2 + 111820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161304460409 is a prime.

It is not a weakly prime, because it can be changed into another prime (161304462409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80652230204 + 80652230205.

It is an arithmetic number, because the mean of its divisors is an integer number (80652230205).

Almost surely, 2^161304460409 is an apocalyptic number.

It is an amenable number.

161304460409 is a deficient number, since it is larger than the sum of its proper divisors (1).

161304460409 is an equidigital number, since it uses as much as digits as its factorization.

161304460409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 161304460409 in words is "one hundred sixty-one billion, three hundred four million, four hundred sixty thousand, four hundred nine".