6447270643 has 4 divisors (see below), whose sum is σ = 7033386168. Its totient is φ = 5861155120.

The previous prime is 6447270617. The next prime is 6447270649. The reversal of 6447270643 is 3460727446.

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 6447270643 - 2⁵ = 6447270611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6447270643.

It is not an unprimeable number, because it can be changed into a prime (6447270649) 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, 293057746 + ... + 293057767.

It is an arithmetic number, because the mean of its divisors is an integer number (1758346542).

Almost surely, 2^6447270643 is an apocalyptic number.

6447270643 is a deficient number, since it is larger than the sum of its proper divisors (586115525).

6447270643 is a wasteful number, since it uses less digits than its factorization.

6447270643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586115524.

The product of its (nonzero) digits is 677376, while the sum is 43.

The square root of 6447270643 is about 80294.8979886020. The cubic root of 6447270643 is about 1861.1953855715.

The spelling of 6447270643 in words is "six billion, four hundred forty-seven million, two hundred seventy thousand, six hundred forty-three".