6399910243 has 2 divisors, whose sum is σ = 6399910244. Its totient is φ = 6399910242.

The previous prime is 6399910217. The next prime is 6399910291. The reversal of 6399910243 is 3420199936.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6399910243 is a prime.

It is a super-2 number, since 2×6399910243² = 81917702236912638098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6399910193 and 6399910202.

It is not a weakly prime, because it can be changed into another prime (6399917243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199955121 + 3199955122.

It is an arithmetic number, because the mean of its divisors is an integer number (3199955122).

Almost surely, 2^6399910243 is an apocalyptic number.

6399910243 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399910243 is an equidigital number, since it uses as much as digits as its factorization.

6399910243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 6399910243 is about 79999.4390167831. The cubic root of 6399910243 is about 1856.6268539235.

The spelling of 6399910243 in words is "six billion, three hundred ninety-nine million, nine hundred ten thousand, two hundred forty-three".