161343721433 has 2 divisors, whose sum is σ = 161343721434. Its totient is φ = 161343721432.

The previous prime is 161343721423. The next prime is 161343721471. The reversal of 161343721433 is 334127343161.

It is an a-pointer prime, because the next prime (161343721471) can be obtained adding 161343721433 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138538795264 + 22804926169 = 372208^2 + 151013^2 .

It is a cyclic number.

It is not a de Polignac number, because 161343721433 - 2⁶ = 161343721369 is a prime.

It is not a weakly prime, because it can be changed into another prime (161343721423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80671860716 + 80671860717.

It is an arithmetic number, because the mean of its divisors is an integer number (80671860717).

Almost surely, 2^161343721433 is an apocalyptic number.

It is an amenable number.

161343721433 is a deficient number, since it is larger than the sum of its proper divisors (1).

161343721433 is an equidigital number, since it uses as much as digits as its factorization.

161343721433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 38.

The spelling of 161343721433 in words is "one hundred sixty-one billion, three hundred forty-three million, seven hundred twenty-one thousand, four hundred thirty-three".