6447789211 has 4 divisors (see below), whose sum is σ = 6670126800. Its totient is φ = 6225451624.

The previous prime is 6447789209. The next prime is 6447789277. The reversal of 6447789211 is 1129877446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6447789211 - 2¹ = 6447789209 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6447789281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111168751 + ... + 111168808.

It is an arithmetic number, because the mean of its divisors is an integer number (1667531700).

Almost surely, 2^6447789211 is an apocalyptic number.

6447789211 is a deficient number, since it is larger than the sum of its proper divisors (222337589).

6447789211 is a wasteful number, since it uses less digits than its factorization.

6447789211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222337588.

The product of its digits is 677376, while the sum is 49.

The square root of 6447789211 is about 80298.1270703122. The cubic root of 6447789211 is about 1861.2452842313.

The spelling of 6447789211 in words is "six billion, four hundred forty-seven million, seven hundred eighty-nine thousand, two hundred eleven".