163655605 has 4 divisors (see below), whose sum is σ = 196386732. Its totient is φ = 130924480.

The previous prime is 163655599. The next prime is 163655621. The reversal of 163655605 is 506556361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506556361 = 17 ⋅29797433.

It can be written as a sum of positive squares in 2 ways, for example, as 122810724 + 40844881 = 11082^2 + 6391^2 .

It is not a de Polignac number, because 163655605 - 2¹³ = 163647413 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 3 ways as a sum of consecutive naturals, for example, 16365556 + ... + 16365565.

It is an arithmetic number, because the mean of its divisors is an integer number (49096683).

Almost surely, 2^163655605 is an apocalyptic number.

It is an amenable number.

163655605 is a deficient number, since it is larger than the sum of its proper divisors (32731127).

163655605 is an equidigital number, since it uses as much as digits as its factorization.

163655605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32731126.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 163655605 is about 12792.7950425230. The cubic root of 163655605 is about 546.9869452683.

The spelling of 163655605 in words is "one hundred sixty-three million, six hundred fifty-five thousand, six hundred five".