9909982679 has 2 divisors, whose sum is σ = 9909982680. Its totient is φ = 9909982678.

The previous prime is 9909982673. The next prime is 9909982697. The reversal of 9909982679 is 9762899099.

Together with next prime (9909982697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9909982679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9909982673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954991339 + 4954991340.

It is an arithmetic number, because the mean of its divisors is an integer number (4954991340).

Almost surely, 2^9909982679 is an apocalyptic number.

9909982679 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909982679 is an equidigital number, since it uses as much as digits as its factorization.

9909982679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39680928, while the sum is 68.

The square root of 9909982679 is about 99548.8959205475. The cubic root of 9909982679 is about 2147.9506470951.

The spelling of 9909982679 in words is "nine billion, nine hundred nine million, nine hundred eighty-two thousand, six hundred seventy-nine".