6449309818 has 16 divisors (see below), whose sum is σ = 11057068800. Its totient is φ = 2763712656.

The previous prime is 6449309813. The next prime is 6449309837. The reversal of 6449309818 is 8189039446.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6449309813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187855 + ... + 219517.

It is an arithmetic number, because the mean of its divisors is an integer number (691066800).

Almost surely, 2^6449309818 is an apocalyptic number.

6449309818 is a deficient number, since it is larger than the sum of its proper divisors (4607758982).

6449309818 is a wasteful number, since it uses less digits than its factorization.

6449309818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46221.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 6449309818 is about 80307.5950206455. The cubic root of 6449309818 is about 1861.3915876157.

The spelling of 6449309818 in words is "six billion, four hundred forty-nine million, three hundred nine thousand, eight hundred eighteen".