161605330445 has 16 divisors (see below), whose sum is σ = 217923979392. Its totient is φ = 114150653760.

The previous prime is 161605330441. The next prime is 161605330451. The reversal of 161605330445 is 544033506161.

It is not a de Polignac number, because 161605330445 - 2² = 161605330441 is a prime.

It is a super-2 number, since 2×161605330445² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161605330399 and 161605330408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605330441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54047111 + ... + 54050100.

It is an arithmetic number, because the mean of its divisors is an integer number (13620248712).

Almost surely, 2^161605330445 is an apocalyptic number.

It is an amenable number.

161605330445 is a deficient number, since it is larger than the sum of its proper divisors (56318648947).

161605330445 is a wasteful number, since it uses less digits than its factorization.

161605330445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108097252.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 161605330445 in words is "one hundred sixty-one billion, six hundred five million, three hundred thirty thousand, four hundred forty-five".