163601443463561 has 2 divisors, whose sum is σ = 163601443463562. Its totient is φ = 163601443463560.

The previous prime is 163601443463543. The next prime is 163601443463567. The reversal of 163601443463561 is 165364344106361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162477239182336 + 1124204281225 = 12746656^2 + 1060285^2 .

It is a cyclic number.

It is not a de Polignac number, because 163601443463561 - 2²⁶ = 163601376354697 is a prime.

It is not a weakly prime, because it can be changed into another prime (163601443463567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81800721731780 + 81800721731781.

It is an arithmetic number, because the mean of its divisors is an integer number (81800721731781).

Almost surely, 2^{163601443463561} is an apocalyptic number.

It is an amenable number.

163601443463561 is a deficient number, since it is larger than the sum of its proper divisors (1).

163601443463561 is an equidigital number, since it uses as much as digits as its factorization.

163601443463561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11197440, while the sum is 53.

The spelling of 163601443463561 in words is "one hundred sixty-three trillion, six hundred one billion, four hundred forty-three million, four hundred sixty-three thousand, five hundred sixty-one".