163766641 has 2 divisors, whose sum is σ = 163766642. Its totient is φ = 163766640.

The previous prime is 163766623. The next prime is 163766663. The reversal of 163766641 is 146667361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86397025 + 77369616 = 9295^2 + 8796^2 .

It is a cyclic number.

It is not a de Polignac number, because 163766641 - 2⁵ = 163766609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163766594 and 163766603.

It is not a weakly prime, because it can be changed into another prime (163766611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81883320 + 81883321.

It is an arithmetic number, because the mean of its divisors is an integer number (81883321).

Almost surely, 2^163766641 is an apocalyptic number.

It is an amenable number.

163766641 is a deficient number, since it is larger than the sum of its proper divisors (1).

163766641 is an equidigital number, since it uses as much as digits as its factorization.

163766641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 163766641 is about 12797.1340932257. The cubic root of 163766641 is about 547.1106226942.

The spelling of 163766641 in words is "one hundred sixty-three million, seven hundred sixty-six thousand, six hundred forty-one".