163405885 has 8 divisors (see below), whose sum is σ = 199301976. Its totient is φ = 128581440.

The previous prime is 163405873. The next prime is 163405903. The reversal of 163405885 is 588504361.

It can be written as a sum of positive squares in 4 ways, for example, as 19909444 + 143496441 = 4462^2 + 11979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163405885 - 2²⁷ = 29188157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267574 + ... + 268183.

It is an arithmetic number, because the mean of its divisors is an integer number (24912747).

Almost surely, 2^163405885 is an apocalyptic number.

It is an amenable number.

163405885 is a deficient number, since it is larger than the sum of its proper divisors (35896091).

163405885 is an equidigital number, since it uses as much as digits as its factorization.

163405885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535823.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 163405885 is about 12783.0311350634. The cubic root of 163405885 is about 546.7085901734.

The spelling of 163405885 in words is "one hundred sixty-three million, four hundred five thousand, eight hundred eighty-five".