79999899979 has 2 divisors, whose sum is σ = 79999899980. Its totient is φ = 79999899978.

The previous prime is 79999899977. The next prime is 79999900003. The reversal of 79999899979 is 97999899997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79999899979 - 2¹ = 79999899977 is a prime.

Together with 79999899977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79999899977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39999949989 + 39999949990.

It is an arithmetic number, because the mean of its divisors is an integer number (39999949990).

Almost surely, 2^79999899979 is an apocalyptic number.

79999899979 is a deficient number, since it is larger than the sum of its proper divisors (1).

79999899979 is an equidigital number, since it uses as much as digits as its factorization.

79999899979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16874314632, while the sum is 94.

The spelling of 79999899979 in words is "seventy-nine billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, nine hundred seventy-nine".