6449810639 has 2 divisors, whose sum is σ = 6449810640. Its totient is φ = 6449810638.

The previous prime is 6449810629. The next prime is 6449810681. The reversal of 6449810639 is 9360189446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6449810639 - 2⁸ = 6449810383 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6449810629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224905319 + 3224905320.

It is an arithmetic number, because the mean of its divisors is an integer number (3224905320).

Almost surely, 2^6449810639 is an apocalyptic number.

6449810639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6449810639 is an equidigital number, since it uses as much as digits as its factorization.

6449810639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 6449810639 is about 80310.7131023004. The cubic root of 6449810639 is about 1861.4397684750.

The spelling of 6449810639 in words is "six billion, four hundred forty-nine million, eight hundred ten thousand, six hundred thirty-nine".