161173711262281 has 2 divisors, whose sum is σ = 161173711262282. Its totient is φ = 161173711262280.

The previous prime is 161173711262261. The next prime is 161173711262299. The reversal of 161173711262281 is 182262117371161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161119636410681 + 54074851600 = 12693291^2 + 232540^2 .

It is a cyclic number.

It is not a de Polignac number, because 161173711262281 - 2¹³ = 161173711254089 is a prime.

It is a super-2 number, since 2×161173711262281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161173711262261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80586855631140 + 80586855631141.

It is an arithmetic number, because the mean of its divisors is an integer number (80586855631141).

Almost surely, 2^{161173711262281} is an apocalyptic number.

It is an amenable number.

161173711262281 is a deficient number, since it is larger than the sum of its proper divisors (1).

161173711262281 is an equidigital number, since it uses as much as digits as its factorization.

161173711262281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 49.

The spelling of 161173711262281 in words is "one hundred sixty-one trillion, one hundred seventy-three billion, seven hundred eleven million, two hundred sixty-two thousand, two hundred eighty-one".