9978366077 has 2 divisors, whose sum is σ = 9978366078. Its totient is φ = 9978366076.

The previous prime is 9978366071. The next prime is 9978366113. The reversal of 9978366077 is 7706638799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9962834596 + 15531481 = 99814^2 + 3941^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978366077 - 2²² = 9974171773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9978366071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989183038 + 4989183039.

It is an arithmetic number, because the mean of its divisors is an integer number (4989183039).

Almost surely, 2^9978366077 is an apocalyptic number.

It is an amenable number.

9978366077 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978366077 is an equidigital number, since it uses as much as digits as its factorization.

9978366077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24004512, while the sum is 62.

The square root of 9978366077 is about 99891.7718183034. The cubic root of 9978366077 is about 2152.8799391739.

The spelling of 9978366077 in words is "nine billion, nine hundred seventy-eight million, three hundred sixty-six thousand, seventy-seven".