6449643223 has 2 divisors, whose sum is σ = 6449643224. Its totient is φ = 6449643222.

The previous prime is 6449643191. The next prime is 6449643281. The reversal of 6449643223 is 3223469446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6449643223 - 2⁵ = 6449643191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6449643223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6449643523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224821611 + 3224821612.

It is an arithmetic number, because the mean of its divisors is an integer number (3224821612).

Almost surely, 2^6449643223 is an apocalyptic number.

6449643223 is a deficient number, since it is larger than the sum of its proper divisors (1).

6449643223 is an equidigital number, since it uses as much as digits as its factorization.

6449643223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 43.

The square root of 6449643223 is about 80309.6707937469. The cubic root of 6449643223 is about 1861.4236627051.

The spelling of 6449643223 in words is "six billion, four hundred forty-nine million, six hundred forty-three thousand, two hundred twenty-three".