163640841 has 48 divisors (see below), whose sum is σ = 275817600. Its totient is φ = 86224320.

The previous prime is 163640831. The next prime is 163640849. The reversal of 163640841 is 148046361.

It is not a de Polignac number, because 163640841 - 2⁵ = 163640809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163640849) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173431 + ... + 174371.

It is an arithmetic number, because the mean of its divisors is an integer number (5746200).

Almost surely, 2^163640841 is an apocalyptic number.

It is an amenable number.

163640841 is a deficient number, since it is larger than the sum of its proper divisors (112176759).

163640841 is an equidigital number, since it uses as much as digits as its factorization.

163640841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 163640841 is about 12792.2179859476. The cubic root of 163640841 is about 546.9704961767.

The spelling of 163640841 in words is "one hundred sixty-three million, six hundred forty thousand, eight hundred forty-one".