161233305305 has 4 divisors (see below), whose sum is σ = 193479966372. Its totient is φ = 128986644240.

The previous prime is 161233305283. The next prime is 161233305323. The reversal of 161233305305 is 503503332161.

161233305305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503503332161 = 50359 ⋅9998279.

It can be written as a sum of positive squares in 2 ways, for example, as 21584604889 + 139648700416 = 146917^2 + 373696^2 .

It is not a de Polignac number, because 161233305305 - 2²⁰ = 161232256729 is a prime.

It is a super-2 number, since 2×161233305305² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 16123330526 + ... + 16123330535.

It is an arithmetic number, because the mean of its divisors is an integer number (48369991593).

Almost surely, 2^161233305305 is an apocalyptic number.

It is an amenable number.

161233305305 is a deficient number, since it is larger than the sum of its proper divisors (32246661067).

161233305305 is an equidigital number, since it uses as much as digits as its factorization.

161233305305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32246661066.

The product of its (nonzero) digits is 24300, while the sum is 32.

Adding to 161233305305 its reverse (503503332161), we get a palindrome (664736637466).

The spelling of 161233305305 in words is "one hundred sixty-one billion, two hundred thirty-three million, three hundred five thousand, three hundred five".