7999779979 has 2 divisors, whose sum is σ = 7999779980. Its totient is φ = 7999779978.

The previous prime is 7999779929. The next prime is 7999780057. The reversal of 7999779979 is 9799779997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7999779979 - 2¹⁵ = 7999747211 is a prime.

It is a super-3 number, since 3×7999779979³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7999779919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999889989 + 3999889990.

It is an arithmetic number, because the mean of its divisors is an integer number (3999889990).

Almost surely, 2^7999779979 is an apocalyptic number.

7999779979 is a deficient number, since it is larger than the sum of its proper divisors (1).

7999779979 is an equidigital number, since it uses as much as digits as its factorization.

7999779979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1275989841, while the sum is 82.

The square root of 7999779979 is about 89441.4891367535. The cubic root of 7999779979 is about 1999.9816647486.

The spelling of 7999779979 in words is "seven billion, nine hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred seventy-nine".