163661604 has 12 divisors (see below), whose sum is σ = 381877104. Its totient is φ = 54553864.

The previous prime is 163661591. The next prime is 163661623. The reversal of 163661604 is 406166361.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6819222 + ... + 6819245.

It is an arithmetic number, because the mean of its divisors is an integer number (31823092).

Almost surely, 2^163661604 is an apocalyptic number.

It is an amenable number.

163661604 is an abundant number, since it is smaller than the sum of its proper divisors (218215500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163661604 is a wasteful number, since it uses less digits than its factorization.

163661604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13638474 (or 13638472 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 163661604 is about 12793.0295082908. The cubic root of 163661604 is about 546.9936286825.

The spelling of 163661604 in words is "one hundred sixty-three million, six hundred sixty-one thousand, six hundred four".