163647641 has 2 divisors, whose sum is σ = 163647642. Its totient is φ = 163647640.

The previous prime is 163647611. The next prime is 163647643. The reversal of 163647641 is 146746361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108576400 + 55071241 = 10420^2 + 7421^2 .

It is a cyclic number.

It is not a de Polignac number, because 163647641 - 2¹⁴ = 163631257 is a prime.

Together with 163647643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 163647595 and 163647604.

It is not a weakly prime, because it can be changed into another prime (163647643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81823820 + 81823821.

It is an arithmetic number, because the mean of its divisors is an integer number (81823821).

Almost surely, 2^163647641 is an apocalyptic number.

It is an amenable number.

163647641 is a deficient number, since it is larger than the sum of its proper divisors (1).

163647641 is an equidigital number, since it uses as much as digits as its factorization.

163647641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 163647641 is about 12792.4837697767. The cubic root of 163647641 is about 546.9780724187.

The spelling of 163647641 in words is "one hundred sixty-three million, six hundred forty-seven thousand, six hundred forty-one".