163661601 has 16 divisors (see below), whose sum is σ = 233440704. Its totient is φ = 101627904.

The previous prime is 163661591. The next prime is 163661623. The reversal of 163661601 is 106166361.

It is not a de Polignac number, because 163661601 - 2¹⁴ = 163645217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163661671) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11595 + ... + 21488.

It is an arithmetic number, because the mean of its divisors is an integer number (14590044).

Almost surely, 2^163661601 is an apocalyptic number.

It is an amenable number.

163661601 is a deficient number, since it is larger than the sum of its proper divisors (69779103).

163661601 is a wasteful number, since it uses less digits than its factorization.

163661601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33200.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 163661601 is about 12793.0293910395. The cubic root of 163661601 is about 546.9936253403.

The spelling of 163661601 in words is "one hundred sixty-three million, six hundred sixty-one thousand, six hundred one".