163606254663461 has 2 divisors, whose sum is σ = 163606254663462. Its totient is φ = 163606254663460.

The previous prime is 163606254663451. The next prime is 163606254663463. The reversal of 163606254663461 is 164366452606361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130755359998561 + 32850894664900 = 11434831^2 + 5731570^2 .

It is an emirp because it is prime and its reverse (164366452606361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163606254663461 is a prime.

Together with 163606254663463, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163606254663461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163606254663463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81803127331730 + 81803127331731.

It is an arithmetic number, because the mean of its divisors is an integer number (81803127331731).

Almost surely, 2^{163606254663461} is an apocalyptic number.

It is an amenable number.

163606254663461 is a deficient number, since it is larger than the sum of its proper divisors (1).

163606254663461 is an equidigital number, since it uses as much as digits as its factorization.

163606254663461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67184640, while the sum is 59.

The spelling of 163606254663461 in words is "one hundred sixty-three trillion, six hundred six billion, two hundred fifty-four million, six hundred sixty-three thousand, four hundred sixty-one".