163505444 has 6 divisors (see below), whose sum is σ = 286134534. Its totient is φ = 81752720.

The previous prime is 163505443. The next prime is 163505449. The reversal of 163505444 is 444505361.

It can be written as a sum of positive squares in only one way, i.e., 110040100 + 53465344 = 10490^2 + 7312^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 163505444.

It is not an unprimeable number, because it can be changed into a prime (163505443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20438177 + ... + 20438184.

It is an arithmetic number, because the mean of its divisors is an integer number (47689089).

Almost surely, 2^163505444 is an apocalyptic number.

It is an amenable number.

163505444 is a deficient number, since it is larger than the sum of its proper divisors (122629090).

163505444 is a wasteful number, since it uses less digits than its factorization.

163505444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40876365 (or 40876363 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 163505444 is about 12786.9247280181. The cubic root of 163505444 is about 546.8195994557.

The spelling of 163505444 in words is "one hundred sixty-three million, five hundred five thousand, four hundred forty-four".