6436430257 has 2 divisors, whose sum is σ = 6436430258. Its totient is φ = 6436430256.

The previous prime is 6436430251. The next prime is 6436430261. The reversal of 6436430257 is 7520346346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5387706801 + 1048723456 = 73401^2 + 32384^2 .

It is a cyclic number.

It is not a de Polignac number, because 6436430257 - 2¹¹ = 6436428209 is a prime.

It is not a weakly prime, because it can be changed into another prime (6436430251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3218215128 + 3218215129.

It is an arithmetic number, because the mean of its divisors is an integer number (3218215129).

Almost surely, 2^6436430257 is an apocalyptic number.

It is an amenable number.

6436430257 is a deficient number, since it is larger than the sum of its proper divisors (1).

6436430257 is an equidigital number, since it uses as much as digits as its factorization.

6436430257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 40.

The square root of 6436430257 is about 80227.3660106076. The cubic root of 6436430257 is about 1860.1516676918.

The spelling of 6436430257 in words is "six billion, four hundred thirty-six million, four hundred thirty thousand, two hundred fifty-seven".