161156606101217 has 2 divisors, whose sum is σ = 161156606101218. Its totient is φ = 161156606101216.

The previous prime is 161156606101171. The next prime is 161156606101289. The reversal of 161156606101217 is 712101606651161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149149577207761 + 12007028893456 = 12212681^2 + 3465116^2 .

It is an emirp because it is prime and its reverse (712101606651161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161156606101217 - 2²² = 161156601906913 is a prime.

It is not a weakly prime, because it can be changed into another prime (161156606101297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80578303050608 + 80578303050609.

It is an arithmetic number, because the mean of its divisors is an integer number (80578303050609).

Almost surely, 2^{161156606101217} is an apocalyptic number.

It is an amenable number.

161156606101217 is a deficient number, since it is larger than the sum of its proper divisors (1).

161156606101217 is an equidigital number, since it uses as much as digits as its factorization.

161156606101217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 161156606101217 in words is "one hundred sixty-one trillion, one hundred fifty-six billion, six hundred six million, one hundred one thousand, two hundred seventeen".