9978559793 has 2 divisors, whose sum is σ = 9978559794. Its totient is φ = 9978559792.

The previous prime is 9978559781. The next prime is 9978559891. The reversal of 9978559793 is 3979558799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5020005904 + 4958553889 = 70852^2 + 70417^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978559793 - 2²⁶ = 9911450929 is a prime.

It is not a weakly prime, because it can be changed into another prime (9978559733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989279896 + 4989279897.

It is an arithmetic number, because the mean of its divisors is an integer number (4989279897).

Almost surely, 2^9978559793 is an apocalyptic number.

It is an amenable number.

9978559793 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978559793 is an equidigital number, since it uses as much as digits as its factorization.

9978559793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192893400, while the sum is 71.

The square root of 9978559793 is about 99892.7414430098. The cubic root of 9978559793 is about 2152.8938707998.

The spelling of 9978559793 in words is "nine billion, nine hundred seventy-eight million, five hundred fifty-nine thousand, seven hundred ninety-three".