6445718699 has 8 divisors (see below), whose sum is σ = 7371494880. Its totient is φ = 5521182336.

The previous prime is 6445718689. The next prime is 6445718711. The reversal of 6445718699 is 9968175446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6445718699 - 2⁴ = 6445718683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6445718689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298784 + ... + 319629.

It is an arithmetic number, because the mean of its divisors is an integer number (921436860).

Almost surely, 2^6445718699 is an apocalyptic number.

6445718699 is a deficient number, since it is larger than the sum of its proper divisors (925776181).

6445718699 is a wasteful number, since it uses less digits than its factorization.

6445718699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619909.

The product of its digits is 13063680, while the sum is 59.

The square root of 6445718699 is about 80285.2333807407. The cubic root of 6445718699 is about 1861.0460354063.

The spelling of 6445718699 in words is "six billion, four hundred forty-five million, seven hundred eighteen thousand, six hundred ninety-nine".