161606115617 has 2 divisors, whose sum is σ = 161606115618. Its totient is φ = 161606115616.

The previous prime is 161606115557. The next prime is 161606115667. The reversal of 161606115617 is 716511606161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132116983441 + 29489132176 = 363479^2 + 171724^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606115617 - 2¹² = 161606111521 is a prime.

It is a super-2 number, since 2×161606115617² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161606115667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803057808 + 80803057809.

It is an arithmetic number, because the mean of its divisors is an integer number (80803057809).

Almost surely, 2^161606115617 is an apocalyptic number.

It is an amenable number.

161606115617 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606115617 is an equidigital number, since it uses as much as digits as its factorization.

161606115617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 161606115617 in words is "one hundred sixty-one billion, six hundred six million, one hundred fifteen thousand, six hundred seventeen".