161566012227177 has 6 divisors (see below), whose sum is σ = 233373128772602. Its totient is φ = 107710674818112.

The previous prime is 161566012227161. The next prime is 161566012227241. The reversal of 161566012227177 is 771722210665161.

161566012227177 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 6 + 601 + 2 + 2 + 27 + 1 + 7 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 82237402058256 + 79328610168921 = 9068484^2 + 8906661^2 .

It is not a de Polignac number, because 161566012227177 - 2⁴ = 161566012227161 is a prime.

It is a super-2 number, since 2×161566012227177² (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 (161566012277177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8975889568168 + ... + 8975889568185.

Almost surely, 2^{161566012227177} is an apocalyptic number.

It is an amenable number.

161566012227177 is a deficient number, since it is larger than the sum of its proper divisors (71807116545425).

161566012227177 is a wasteful number, since it uses less digits than its factorization.

161566012227177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17951779136359 (or 17951779136356 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 161566012227177 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, twelve million, two hundred twenty-seven thousand, one hundred seventy-seven".