161656110066305 has 8 divisors (see below), whose sum is σ = 194562962147112. Its totient is φ = 128941134674688.

The previous prime is 161656110066287. The next prime is 161656110066331. The reversal of 161656110066305 is 503660011656161.

It can be written as a sum of positive squares in 4 ways, for example, as 6372635750464 + 155283474315841 = 2524408^2 + 12461279^2 .

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 161656110066305 - 2⁸ = 161656110066049 is a prime.

It is a super-2 number, since 2×161656110066305² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161656110066305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47969170442 + ... + 47969173811.

It is an arithmetic number, because the mean of its divisors is an integer number (24320370268389).

Almost surely, 2^{161656110066305} is an apocalyptic number.

It is an amenable number.

161656110066305 is a deficient number, since it is larger than the sum of its proper divisors (32906852080807).

161656110066305 is an equidigital number, since it uses as much as digits as its factorization.

161656110066305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95938344595.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 161656110066305 in words is "one hundred sixty-one trillion, six hundred fifty-six billion, one hundred ten million, sixty-six thousand, three hundred five".