163661201 has 4 divisors (see below), whose sum is σ = 178539504. Its totient is φ = 148782900.

The previous prime is 163661189. The next prime is 163661207. The reversal of 163661201 is 102166361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163661201 - 2⁶ = 163661137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163661207) 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 3 ways as a sum of consecutive naturals, for example, 7439135 + ... + 7439156.

It is an arithmetic number, because the mean of its divisors is an integer number (44634876).

Almost surely, 2^163661201 is an apocalyptic number.

163661201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163661201 is a deficient number, since it is larger than the sum of its proper divisors (14878303).

163661201 is a wasteful number, since it uses less digits than its factorization.

163661201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14878302.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 163661201 is about 12793.0137575162. The cubic root of 163661201 is about 546.9931797101.

The spelling of 163661201 in words is "one hundred sixty-three million, six hundred sixty-one thousand, two hundred one".