161445047917 has 2 divisors, whose sum is σ = 161445047918. Its totient is φ = 161445047916.

The previous prime is 161445047903. The next prime is 161445047947. The reversal of 161445047917 is 719740544161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111436460041 + 50008587876 = 333821^2 + 223626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161445047917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161445047947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80722523958 + 80722523959.

It is an arithmetic number, because the mean of its divisors is an integer number (80722523959).

Almost surely, 2^161445047917 is an apocalyptic number.

It is an amenable number.

161445047917 is a deficient number, since it is larger than the sum of its proper divisors (1).

161445047917 is an equidigital number, since it uses as much as digits as its factorization.

161445047917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 161445047917 in words is "one hundred sixty-one billion, four hundred forty-five million, forty-seven thousand, nine hundred seventeen".