6400634843 has 2 divisors, whose sum is σ = 6400634844. Its totient is φ = 6400634842.

The previous prime is 6400634831. The next prime is 6400634939. The reversal of 6400634843 is 3484360046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400634843 - 2⁸ = 6400634587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6400634797 and 6400634806.

It is not a weakly prime, because it can be changed into another prime (6400634803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200317421 + 3200317422.

It is an arithmetic number, because the mean of its divisors is an integer number (3200317422).

Almost surely, 2^6400634843 is an apocalyptic number.

6400634843 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400634843 is an equidigital number, since it uses as much as digits as its factorization.

6400634843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 6400634843 is about 80003.9676703599. The cubic root of 6400634843 is about 1856.6969205858.

Adding to 6400634843 its reverse (3484360046), we get a palindrome (9884994889).

The spelling of 6400634843 in words is "six billion, four hundred million, six hundred thirty-four thousand, eight hundred forty-three".