161605752361 has 16 divisors (see below), whose sum is σ = 166845279744. Its totient is φ = 156444943104.

The previous prime is 161605752323. The next prime is 161605752383. The reversal of 161605752361 is 163257506161.

It is a cyclic number.

It is not a de Polignac number, because 161605752361 - 2¹⁵ = 161605719593 is a prime.

It is a super-2 number, since 2×161605752361² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161605755361) 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, 4129261 + ... + 4168213.

It is an arithmetic number, because the mean of its divisors is an integer number (10427829984).

Almost surely, 2^161605752361 is an apocalyptic number.

It is an amenable number.

161605752361 is a deficient number, since it is larger than the sum of its proper divisors (5239527383).

161605752361 is a wasteful number, since it uses less digits than its factorization.

161605752361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39960.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 161605752361 in words is "one hundred sixty-one billion, six hundred five million, seven hundred fifty-two thousand, three hundred sixty-one".