161785800044 has 24 divisors (see below), whose sum is σ = 309071355600. Its totient is φ = 73489582080.

The previous prime is 161785799983. The next prime is 161785800049. The reversal of 161785800044 is 440008587161.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 161785799968 and 161785800004.

It is not an unprimeable number, because it can be changed into a prime (161785800049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169189 + ... + 1300220.

It is an arithmetic number, because the mean of its divisors is an integer number (12877973150).

Almost surely, 2^161785800044 is an apocalyptic number.

It is an amenable number.

161785800044 is a deficient number, since it is larger than the sum of its proper divisors (147285555556).

161785800044 is a wasteful number, since it uses less digits than its factorization.

161785800044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470913 (or 2470911 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 161785800044 in words is "one hundred sixty-one billion, seven hundred eighty-five million, eight hundred thousand, forty-four".