163405705 has 16 divisors (see below), whose sum is σ = 201502224. Its totient is φ = 127134720.

The previous prime is 163405687. The next prime is 163405709. The reversal of 163405705 is 507504361.

It can be written as a sum of positive squares in 8 ways, for example, as 54641664 + 108764041 = 7392^2 + 10429^2 .

It is not a de Polignac number, because 163405705 - 2¹⁷ = 163274633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163405709) 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, 75397 + ... + 77533.

It is an arithmetic number, because the mean of its divisors is an integer number (12593889).

Almost surely, 2^163405705 is an apocalyptic number.

It is an amenable number.

163405705 is a deficient number, since it is larger than the sum of its proper divisors (38096519).

163405705 is a wasteful number, since it uses less digits than its factorization.

163405705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 163405705 is about 12783.0240944778. The cubic root of 163405705 is about 546.7083894307.

The spelling of 163405705 in words is "one hundred sixty-three million, four hundred five thousand, seven hundred five".