6444926889 has 4 divisors (see below), whose sum is σ = 8593235856. Its totient is φ = 4296617924.

The previous prime is 6444926867. The next prime is 6444926909. The reversal of 6444926889 is 9886294446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6444926889 - 2⁸ = 6444926633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6444926849) 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, 1074154479 + ... + 1074154484.

It is an arithmetic number, because the mean of its divisors is an integer number (2148308964).

Almost surely, 2^6444926889 is an apocalyptic number.

It is an amenable number.

6444926889 is a deficient number, since it is larger than the sum of its proper divisors (2148308967).

6444926889 is a wasteful number, since it uses less digits than its factorization.

6444926889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148308966.

The product of its digits is 23887872, while the sum is 60.

The square root of 6444926889 is about 80280.3019986846. The cubic root of 6444926889 is about 1860.9698269298.

The spelling of 6444926889 in words is "six billion, four hundred forty-four million, nine hundred twenty-six thousand, eight hundred eighty-nine".