9978601277 has 2 divisors, whose sum is σ = 9978601278. Its totient is φ = 9978601276.

The previous prime is 9978601229. The next prime is 9978601301. The reversal of 9978601277 is 7721068799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7572306361 + 2406294916 = 87019^2 + 49054^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978601277 - 2²² = 9974406973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9978603277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989300638 + 4989300639.

It is an arithmetic number, because the mean of its divisors is an integer number (4989300639).

Almost surely, 2^9978601277 is an apocalyptic number.

It is an amenable number.

9978601277 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978601277 is an equidigital number, since it uses as much as digits as its factorization.

9978601277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The square root of 9978601277 is about 99892.9490855085. The cubic root of 9978601277 is about 2152.8968542138.

The spelling of 9978601277 in words is "nine billion, nine hundred seventy-eight million, six hundred one thousand, two hundred seventy-seven".