161042644249 has 2 divisors, whose sum is σ = 161042644250. Its totient is φ = 161042644248.

The previous prime is 161042644207. The next prime is 161042644267. The reversal of 161042644249 is 942446240161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139526155024 + 21516489225 = 373532^2 + 146685^2 .

It is a cyclic number.

It is not a de Polignac number, because 161042644249 - 2²¹ = 161040547097 is a prime.

It is not a weakly prime, because it can be changed into another prime (161042644349) 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, 80521322124 + 80521322125.

It is an arithmetic number, because the mean of its divisors is an integer number (80521322125).

Almost surely, 2^161042644249 is an apocalyptic number.

It is an amenable number.

161042644249 is a deficient number, since it is larger than the sum of its proper divisors (1).

161042644249 is an equidigital number, since it uses as much as digits as its factorization.

161042644249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 161042644249 in words is "one hundred sixty-one billion, forty-two million, six hundred forty-four thousand, two hundred forty-nine".