163603661 has 12 divisors (see below), whose sum is σ = 186484320. Its totient is φ = 143067600.

The previous prime is 163603651. The next prime is 163603697. The reversal of 163603661 is 166306361.

It is not a de Polignac number, because 163603661 - 2¹⁸ = 163341517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163603651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22265 + ... + 28686.

It is an arithmetic number, because the mean of its divisors is an integer number (15540360).

Almost surely, 2^163603661 is an apocalyptic number.

It is an amenable number.

163603661 is a deficient number, since it is larger than the sum of its proper divisors (22880659).

163603661 is a wasteful number, since it uses less digits than its factorization.

163603661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50996 (or 50983 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 163603661 is about 12790.7646761247. The cubic root of 163603661 is about 546.9290682477.

The spelling of 163603661 in words is "one hundred sixty-three million, six hundred three thousand, six hundred sixty-one".