9978448811 has 2 divisors, whose sum is σ = 9978448812. Its totient is φ = 9978448810.

The previous prime is 9978448783. The next prime is 9978448829. The reversal of 9978448811 is 1188448799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9978448811 is a prime.

It is not a weakly prime, because it can be changed into another prime (9978445811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989224405 + 4989224406.

It is an arithmetic number, because the mean of its divisors is an integer number (4989224406).

Almost surely, 2^9978448811 is an apocalyptic number.

9978448811 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978448811 is an equidigital number, since it uses as much as digits as its factorization.

9978448811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 59.

The square root of 9978448811 is about 99892.1859356376. The cubic root of 9978448811 is about 2152.8858892421.

The spelling of 9978448811 in words is "nine billion, nine hundred seventy-eight million, four hundred forty-eight thousand, eight hundred eleven".