9999900679 has 2 divisors, whose sum is σ = 9999900680. Its totient is φ = 9999900678.

The previous prime is 9999900587. The next prime is 9999900721. The reversal of 9999900679 is 9760099999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999900679 - 2⁹ = 9999900167 is a prime.

It is a super-2 number, since 2×9999900679² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999900179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999950339 + 4999950340.

It is an arithmetic number, because the mean of its divisors is an integer number (4999950340).

Almost surely, 2^9999900679 is an apocalyptic number.

9999900679 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999900679 is an equidigital number, since it uses as much as digits as its factorization.

9999900679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22320522, while the sum is 67.

The square root of 9999900679 is about 99999.5033937669. The cubic root of 9999900679 is about 2154.4275573213.

The spelling of 9999900679 in words is "nine billion, nine hundred ninety-nine million, nine hundred thousand, six hundred seventy-nine".