6877578809 has 2 divisors, whose sum is σ = 6877578810. Its totient is φ = 6877578808.

The previous prime is 6877578779. The next prime is 6877578853. The reversal of 6877578809 is 9088757786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6877053184 + 525625 = 82928^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 6877578809 - 2¹² = 6877574713 is a prime.

It is a super-3 number, since 3×6877578809³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6877578209) 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, 3438789404 + 3438789405.

It is an arithmetic number, because the mean of its divisors is an integer number (3438789405).

Almost surely, 2^6877578809 is an apocalyptic number.

It is an amenable number.

6877578809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6877578809 is an equidigital number, since it uses as much as digits as its factorization.

6877578809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47416320, while the sum is 65.

The square root of 6877578809 is about 82931.1691042638. The cubic root of 6877578809 is about 1901.7139482492.

The spelling of 6877578809 in words is "six billion, eight hundred seventy-seven million, five hundred seventy-eight thousand, eight hundred nine".