161038100165 has 8 divisors (see below), whose sum is σ = 193437248280. Its totient is φ = 128702794752.

The previous prime is 161038100161. The next prime is 161038100233. The reversal of 161038100165 is 561001830161.

It can be written as a sum of positive squares in 4 ways, for example, as 34488575521 + 126549524644 = 185711^2 + 355738^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161038100165 - 2² = 161038100161 is a prime.

It is a super-7 number, since 7×161038100165⁷ (a number of 80 digits) contains 7777777 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161038100161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15955124 + ... + 15965213.

It is an arithmetic number, because the mean of its divisors is an integer number (24179656035).

Almost surely, 2^161038100165 is an apocalyptic number.

It is an amenable number.

161038100165 is a deficient number, since it is larger than the sum of its proper divisors (32399148115).

161038100165 is a wasteful number, since it uses less digits than its factorization.

161038100165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31921351.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 161038100165 in words is "one hundred sixty-one billion, thirty-eight million, one hundred thousand, one hundred sixty-five".