161613506869 has 2 divisors, whose sum is σ = 161613506870. Its totient is φ = 161613506868.

The previous prime is 161613506839. The next prime is 161613506911. The reversal of 161613506869 is 968605316161.

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., 151506220644 + 10107286225 = 389238^2 + 100535^2 .

It is a cyclic number.

It is not a de Polignac number, because 161613506869 - 2¹⁹ = 161612982581 is a prime.

It is a super-2 number, since 2×161613506869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161613506839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80806753434 + 80806753435.

It is an arithmetic number, because the mean of its divisors is an integer number (80806753435).

Almost surely, 2^161613506869 is an apocalyptic number.

It is an amenable number.

161613506869 is a deficient number, since it is larger than the sum of its proper divisors (1).

161613506869 is an equidigital number, since it uses as much as digits as its factorization.

161613506869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 161613506869 in words is "one hundred sixty-one billion, six hundred thirteen million, five hundred six thousand, eight hundred sixty-nine".