161200511655605 has 8 divisors (see below), whose sum is σ = 204819473633112. Its totient is φ = 121374502893568.

The previous prime is 161200511655563. The next prime is 161200511655611. The reversal of 161200511655605 is 506556115002161.

It can be written as a sum of positive squares in 4 ways, for example, as 63788862424849 + 97411649230756 = 7986793^2 + 9869734^2 .

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 161200511655605 - 2²⁰ = 161200510607029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948238303772 + ... + 948238303941.

It is an arithmetic number, because the mean of its divisors is an integer number (25602434204139).

Almost surely, 2^{161200511655605} is an apocalyptic number.

It is an amenable number.

161200511655605 is a deficient number, since it is larger than the sum of its proper divisors (43618961977507).

161200511655605 is a wasteful number, since it uses less digits than its factorization.

161200511655605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896476607735.

The product of its (nonzero) digits is 270000, while the sum is 44.

Adding to 161200511655605 its reverse (506556115002161), we get a palindrome (667756626657766).

The spelling of 161200511655605 in words is "one hundred sixty-one trillion, two hundred billion, five hundred eleven million, six hundred fifty-five thousand, six hundred five".