161611101566017 has 16 divisors (see below), whose sum is σ = 174312090227520. Its totient is φ = 149331596198400.

The previous prime is 161611101566011. The next prime is 161611101566051. The reversal of 161611101566017 is 710665101116161.

It is a cyclic number.

It is not a de Polignac number, because 161611101566017 - 2¹⁹ = 161611101041729 is a prime.

It is a super-2 number, since 2×161611101566017² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161611101566011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24392959 + ... + 30302452.

It is an arithmetic number, because the mean of its divisors is an integer number (10894505639220).

Almost surely, 2^{161611101566017} is an apocalyptic number.

It is an amenable number.

161611101566017 is a deficient number, since it is larger than the sum of its proper divisors (12700988661503).

161611101566017 is a wasteful number, since it uses less digits than its factorization.

161611101566017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54699264.

The product of its (nonzero) digits is 45360, while the sum is 43.

The spelling of 161611101566017 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred one million, five hundred sixty-six thousand, seventeen".