6426783977 has 2 divisors, whose sum is σ = 6426783978. Its totient is φ = 6426783976.

The previous prime is 6426783863. The next prime is 6426784027. The reversal of 6426783977 is 7793876246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3880168681 + 2546615296 = 62291^2 + 50464^2 .

It is a cyclic number.

It is not a de Polignac number, because 6426783977 - 2⁸ = 6426783721 is a prime.

It is not a weakly prime, because it can be changed into another prime (6426783277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3213391988 + 3213391989.

It is an arithmetic number, because the mean of its divisors is an integer number (3213391989).

Almost surely, 2^6426783977 is an apocalyptic number.

It is an amenable number.

6426783977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6426783977 is an equidigital number, since it uses as much as digits as its factorization.

6426783977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 59.

The square root of 6426783977 is about 80167.2250798292. The cubic root of 6426783977 is about 1859.2219331142.

The spelling of 6426783977 in words is "six billion, four hundred twenty-six million, seven hundred eighty-three thousand, nine hundred seventy-seven".