6648780377 has 2 divisors, whose sum is σ = 6648780378. Its totient is φ = 6648780376.

The previous prime is 6648780373. The next prime is 6648780389. The reversal of 6648780377 is 7730878466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4679107216 + 1969673161 = 68404^2 + 44381^2 .

It is a cyclic number.

It is not a de Polignac number, because 6648780377 - 2² = 6648780373 is a prime.

It is not a weakly prime, because it can be changed into another prime (6648780373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324390188 + 3324390189.

It is an arithmetic number, because the mean of its divisors is an integer number (3324390189).

Almost surely, 2^6648780377 is an apocalyptic number.

It is an amenable number.

6648780377 is a deficient number, since it is larger than the sum of its proper divisors (1).

6648780377 is an equidigital number, since it uses as much as digits as its factorization.

6648780377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9483264, while the sum is 56.

The square root of 6648780377 is about 81540.0538201932. The cubic root of 6648780377 is about 1880.3873859362.

The spelling of 6648780377 in words is "six billion, six hundred forty-eight million, seven hundred eighty thousand, three hundred seventy-seven".