163641403 has 8 divisors (see below), whose sum is σ = 171812880. Its totient is φ = 155638560.

The previous prime is 163641391. The next prime is 163641421. The reversal of 163641403 is 304146361.

163641403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163641403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163642403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40168 + ... + 44053.

It is an arithmetic number, because the mean of its divisors is an integer number (21476610).

Almost surely, 2^163641403 is an apocalyptic number.

163641403 is a deficient number, since it is larger than the sum of its proper divisors (8171477).

163641403 is an equidigital number, since it uses as much as digits as its factorization.

163641403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84317.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 163641403 is about 12792.2399524086. The cubic root of 163641403 is about 546.9711223387.

Adding to 163641403 its reverse (304146361), we get a palindrome (467787764).

The spelling of 163641403 in words is "one hundred sixty-three million, six hundred forty-one thousand, four hundred three".