6448543639 has 2 divisors, whose sum is σ = 6448543640. Its totient is φ = 6448543638.

The previous prime is 6448543613. The next prime is 6448543643. The reversal of 6448543639 is 9363458446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6448543639 - 2¹¹ = 6448541591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6448543609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224271819 + 3224271820.

It is an arithmetic number, because the mean of its divisors is an integer number (3224271820).

Almost surely, 2^6448543639 is an apocalyptic number.

6448543639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6448543639 is an equidigital number, since it uses as much as digits as its factorization.

6448543639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 52.

The square root of 6448543639 is about 80302.8246016291. The cubic root of 6448543639 is about 1861.3178734940.

The spelling of 6448543639 in words is "six billion, four hundred forty-eight million, five hundred forty-three thousand, six hundred thirty-nine".