7780998779 has 2 divisors, whose sum is σ = 7780998780. Its totient is φ = 7780998778.

The previous prime is 7780998767. The next prime is 7780998781. The reversal of 7780998779 is 9778990877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7780998779 - 2⁴ = 7780998763 is a prime.

It is a Sophie Germain prime.

Together with 7780998781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7780995779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890499389 + 3890499390.

It is an arithmetic number, because the mean of its divisors is an integer number (3890499390).

Almost surely, 2^7780998779 is an apocalyptic number.

7780998779 is a deficient number, since it is larger than the sum of its proper divisors (1).

7780998779 is an equidigital number, since it uses as much as digits as its factorization.

7780998779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112021056, while the sum is 71.

The square root of 7780998779 is about 88209.9698390154. The cubic root of 7780998779 is about 1981.5807852677.

The spelling of 7780998779 in words is "seven billion, seven hundred eighty million, nine hundred ninety-eight thousand, seven hundred seventy-nine".