9716561879 has 2 divisors, whose sum is σ = 9716561880. Its totient is φ = 9716561878.

The previous prime is 9716561861. The next prime is 9716561891. The reversal of 9716561879 is 9781656179.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9716561879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9716561579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4858280939 + 4858280940.

It is an arithmetic number, because the mean of its divisors is an integer number (4858280940).

Almost surely, 2^9716561879 is an apocalyptic number.

9716561879 is a deficient number, since it is larger than the sum of its proper divisors (1).

9716561879 is an equidigital number, since it uses as much as digits as its factorization.

9716561879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 59.

The square root of 9716561879 is about 98572.6223603694. The cubic root of 9716561879 is about 2133.8843268974.

The spelling of 9716561879 in words is "nine billion, seven hundred sixteen million, five hundred sixty-one thousand, eight hundred seventy-nine".