6445444777 has 4 divisors (see below), whose sum is σ = 6458362000. Its totient is φ = 6432527556.

The previous prime is 6445444771. The next prime is 6445444783. The reversal of 6445444777 is 7774445446.

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 an interprime number because it is at equal distance from previous prime (6445444771) and next prime (6445444783).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6445444777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6445444771) 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, 6457863 + ... + 6458860.

It is an arithmetic number, because the mean of its divisors is an integer number (1614590500).

Almost surely, 2^6445444777 is an apocalyptic number.

It is an amenable number.

6445444777 is a deficient number, since it is larger than the sum of its proper divisors (12917223).

6445444777 is a wasteful number, since it uses less digits than its factorization.

6445444777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12917222.

The product of its digits is 10536960, while the sum is 52.

The square root of 6445444777 is about 80283.5274324690. The cubic root of 6445444777 is about 1861.0196722394.

The spelling of 6445444777 in words is "six billion, four hundred forty-five million, four hundred forty-four thousand, seven hundred seventy-seven".