161606155016573 has 2 divisors, whose sum is σ = 161606155016574. Its totient is φ = 161606155016572.

The previous prime is 161606155016569. The next prime is 161606155016587. The reversal of 161606155016573 is 375610551606161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142511116591204 + 19095038425369 = 11937802^2 + 4369787^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606155016573 - 2² = 161606155016569 is a prime.

It is a super-2 number, since 2×161606155016573² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161606155016503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803077508286 + 80803077508287.

It is an arithmetic number, because the mean of its divisors is an integer number (80803077508287).

Almost surely, 2^{161606155016573} is an apocalyptic number.

It is an amenable number.

161606155016573 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606155016573 is an equidigital number, since it uses as much as digits as its factorization.

161606155016573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402000, while the sum is 53.

The spelling of 161606155016573 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred fifty-five million, sixteen thousand, five hundred seventy-three".