6444899999 has 16 divisors (see below), whose sum is σ = 6708095520. Its totient is φ = 6184563840.

The previous prime is 6444899977. The next prime is 6444900013. The reversal of 6444899999 is 9999984446.

It is a cyclic number.

It is not a de Polignac number, because 6444899999 - 2¹⁶ = 6444834463 is a prime.

It is a super-2 number, since 2×6444899999² = 83073471994220400002, which contains 22 as substring.

It is a Duffinian number.

6444899999 is a modest number, since divided by 99999 gives 64448 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444899599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4345112 + ... + 4346594.

It is an arithmetic number, because the mean of its divisors is an integer number (419255970).

Almost surely, 2^6444899999 is an apocalyptic number.

6444899999 is a deficient number, since it is larger than the sum of its proper divisors (263195521).

6444899999 is a wasteful number, since it uses less digits than its factorization.

6444899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330.

The product of its digits is 181398528, while the sum is 71.

The square root of 6444899999 is about 80280.1345228071. The cubic root of 6444899999 is about 1860.9672387676.

The spelling of 6444899999 in words is "six billion, four hundred forty-four million, eight hundred ninety-nine thousand, nine hundred ninety-nine".