163310561 has 2 divisors, whose sum is σ = 163310562. Its totient is φ = 163310560.

The previous prime is 163310549. The next prime is 163310597. The reversal of 163310561 is 165013361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161772961 + 1537600 = 12719^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 163310561 - 2²² = 159116257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163310561.

It is not a weakly prime, because it can be changed into another prime (163300561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81655280 + 81655281.

It is an arithmetic number, because the mean of its divisors is an integer number (81655281).

Almost surely, 2^163310561 is an apocalyptic number.

It is an amenable number.

163310561 is a deficient number, since it is larger than the sum of its proper divisors (1).

163310561 is an equidigital number, since it uses as much as digits as its factorization.

163310561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 163310561 is about 12779.3020544942. The cubic root of 163310561 is about 546.6022606967.

The spelling of 163310561 in words is "one hundred sixty-three million, three hundred ten thousand, five hundred sixty-one".