7979797999 has 2 divisors, whose sum is σ = 7979798000. Its totient is φ = 7979797998.

The previous prime is 7979797949. The next prime is 7979798003. The reversal of 7979797999 is 9997979797.

7979797999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7979797999 - 2¹⁵ = 7979765231 is a prime.

It is a super-2 number, since 2×7979797999² (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 (7979797919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989898999 + 3989899000.

It is an arithmetic number, because the mean of its divisors is an integer number (3989899000).

Almost surely, 2^7979797999 is an apocalyptic number.

7979797999 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979797999 is an equidigital number, since it uses as much as digits as its factorization.

7979797999 is an evil number, because the sum of its binary digits is even.

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

The square root of 7979797999 is about 89329.7150952582. The cubic root of 7979797999 is about 1998.3150808390.

The spelling of 7979797999 in words is "seven billion, nine hundred seventy-nine million, seven hundred ninety-seven thousand, nine hundred ninety-nine".