9817979919773 has 2 divisors, whose sum is σ = 9817979919774. Its totient is φ = 9817979919772.

The previous prime is 9817979919751. The next prime is 9817979919823. The reversal of 9817979919773 is 3779199797189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8565467529124 + 1252512390649 = 2926682^2 + 1119157^2 .

It is a cyclic number.

It is not a de Polignac number, because 9817979919773 - 2¹² = 9817979915677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9817979919743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4908989959886 + 4908989959887.

It is an arithmetic number, because the mean of its divisors is an integer number (4908989959887).

Almost surely, 2^{9817979919773} is an apocalyptic number.

It is an amenable number.

9817979919773 is a deficient number, since it is larger than the sum of its proper divisors (1).

9817979919773 is an equidigital number, since it uses as much as digits as its factorization.

9817979919773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402639576, while the sum is 86.

The spelling of 9817979919773 in words is "nine trillion, eight hundred seventeen billion, nine hundred seventy-nine million, nine hundred nineteen thousand, seven hundred seventy-three".