9878579761 has 2 divisors, whose sum is σ = 9878579762. Its totient is φ = 9878579760.

The previous prime is 9878579719. The next prime is 9878579839. The reversal of 9878579761 is 1679758789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7118128161 + 2760451600 = 84369^2 + 52540^2 .

It is a cyclic number.

It is not a de Polignac number, because 9878579761 - 2¹¹ = 9878577713 is a prime.

It is not a weakly prime, because it can be changed into another prime (9878579701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4939289880 + 4939289881.

It is an arithmetic number, because the mean of its divisors is an integer number (4939289881).

Almost surely, 2^9878579761 is an apocalyptic number.

It is an amenable number.

9878579761 is a deficient number, since it is larger than the sum of its proper divisors (1).

9878579761 is an equidigital number, since it uses as much as digits as its factorization.

9878579761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 67.

The square root of 9878579761 is about 99391.0446720428. The cubic root of 9878579761 is about 2145.6794257921.

The spelling of 9878579761 in words is "nine billion, eight hundred seventy-eight million, five hundred seventy-nine thousand, seven hundred sixty-one".