163506211633549 has 2 divisors, whose sum is σ = 163506211633550. Its totient is φ = 163506211633548.

The previous prime is 163506211633519. The next prime is 163506211633591. The reversal of 163506211633549 is 945336112605361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104251349226025 + 59254862407524 = 10210355^2 + 7697718^2 .

It is a cyclic number.

It is not a de Polignac number, because 163506211633549 - 2⁵ = 163506211633517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163506211633549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163506211633519) 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, 81753105816774 + 81753105816775.

It is an arithmetic number, because the mean of its divisors is an integer number (81753105816775).

Almost surely, 2^{163506211633549} is an apocalyptic number.

It is an amenable number.

163506211633549 is a deficient number, since it is larger than the sum of its proper divisors (1).

163506211633549 is an equidigital number, since it uses as much as digits as its factorization.

163506211633549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10497600, while the sum is 55.

The spelling of 163506211633549 in words is "one hundred sixty-three trillion, five hundred six billion, two hundred eleven million, six hundred thirty-three thousand, five hundred forty-nine".