7798780013 has 2 divisors, whose sum is σ = 7798780014. Its totient is φ = 7798780012.

The previous prime is 7798780007. The next prime is 7798780037. The reversal of 7798780013 is 3100878977.

7798780013 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6642576004 + 1156204009 = 81502^2 + 34003^2 .

It is a cyclic number.

It is not a de Polignac number, because 7798780013 - 2⁴ = 7798779997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7798780063) 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, 3899390006 + 3899390007.

It is an arithmetic number, because the mean of its divisors is an integer number (3899390007).

Almost surely, 2^7798780013 is an apocalyptic number.

It is an amenable number.

7798780013 is a deficient number, since it is larger than the sum of its proper divisors (1).

7798780013 is an equidigital number, since it uses as much as digits as its factorization.

7798780013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 50.

The square root of 7798780013 is about 88310.7015768757. The cubic root of 7798780013 is about 1983.0890811765.

The spelling of 7798780013 in words is "seven billion, seven hundred ninety-eight million, seven hundred eighty thousand, thirteen".