6443950819 has 2 divisors, whose sum is σ = 6443950820. Its totient is φ = 6443950818.

The previous prime is 6443950817. The next prime is 6443950823. The reversal of 6443950819 is 9180593446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6443950819 - 2¹ = 6443950817 is a prime.

It is a super-2 number, since 2×6443950819² = 83049004315381541522, which contains 22 as substring.

Together with 6443950817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6443950813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221975409 + 3221975410.

It is an arithmetic number, because the mean of its divisors is an integer number (3221975410).

Almost surely, 2^6443950819 is an apocalyptic number.

6443950819 is a deficient number, since it is larger than the sum of its proper divisors (1).

6443950819 is an equidigital number, since it uses as much as digits as its factorization.

6443950819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 6443950819 is about 80274.2226309293. Note that the first 3 decimals coincide. The cubic root of 6443950819 is about 1860.8758755912.

The spelling of 6443950819 in words is "six billion, four hundred forty-three million, nine hundred fifty thousand, eight hundred nineteen".