161817738013 has 2 divisors, whose sum is σ = 161817738014. Its totient is φ = 161817738012.

The previous prime is 161817738011. The next prime is 161817738037. The reversal of 161817738013 is 310837718161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160747270489 + 1070467524 = 400933^2 + 32718^2 .

It is a cyclic number.

It is not a de Polignac number, because 161817738013 - 2¹ = 161817738011 is a prime.

Together with 161817738011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161817738011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80908869006 + 80908869007.

It is an arithmetic number, because the mean of its divisors is an integer number (80908869007).

Almost surely, 2^161817738013 is an apocalyptic number.

It is an amenable number.

161817738013 is a deficient number, since it is larger than the sum of its proper divisors (1).

161817738013 is an equidigital number, since it uses as much as digits as its factorization.

161817738013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 161817738013 in words is "one hundred sixty-one billion, eight hundred seventeen million, seven hundred thirty-eight thousand, thirteen".