6445949999 has 4 divisors (see below), whose sum is σ = 6492323880. Its totient is φ = 6399576120.

The previous prime is 6445949989. The next prime is 6445950011. The reversal of 6445949999 is 9999495446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6445949999 - 2⁸ = 6445949743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445949989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23186732 + ... + 23187009.

It is an arithmetic number, because the mean of its divisors is an integer number (1623080970).

Almost surely, 2^6445949999 is an apocalyptic number.

6445949999 is a deficient number, since it is larger than the sum of its proper divisors (46373881).

6445949999 is a wasteful number, since it uses less digits than its factorization.

6445949999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46373880.

The product of its digits is 113374080, while the sum is 68.

The square root of 6445949999 is about 80286.6738568737. The cubic root of 6445949999 is about 1861.0682959081.

The spelling of 6445949999 in words is "six billion, four hundred forty-five million, nine hundred forty-nine thousand, nine hundred ninety-nine".