161220175444 has 24 divisors (see below), whose sum is σ = 300071132928. Its totient is φ = 75528094080.

The previous prime is 161220175349. The next prime is 161220175469. The reversal of 161220175444 is 444571022161.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5300722 + ... + 5331049.

It is an arithmetic number, because the mean of its divisors is an integer number (12502963872).

Almost surely, 2^161220175444 is an apocalyptic number.

It is an amenable number.

161220175444 is a deficient number, since it is larger than the sum of its proper divisors (138850957484).

161220175444 is a wasteful number, since it uses less digits than its factorization.

161220175444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10632015 (or 10632013 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 161220175444 in words is "one hundred sixty-one billion, two hundred twenty million, one hundred seventy-five thousand, four hundred forty-four".