6447277745 has 8 divisors (see below), whose sum is σ = 7737900840. Its totient is φ = 5157043840.

The previous prime is 6447277741. The next prime is 6447277751. The reversal of 6447277745 is 5477727446.

It can be written as a sum of positive squares in 4 ways, for example, as 234212416 + 6213065329 = 15304^2 + 78823^2 .

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

It is not a de Polignac number, because 6447277745 - 2² = 6447277741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6447277741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59516 + ... + 128205.

It is an arithmetic number, because the mean of its divisors is an integer number (967237605).

Almost surely, 2^6447277745 is an apocalyptic number.

It is an amenable number.

6447277745 is a deficient number, since it is larger than the sum of its proper divisors (1290623095).

6447277745 is a wasteful number, since it uses less digits than its factorization.

6447277745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194595.

The product of its digits is 9219840, while the sum is 53.

The square root of 6447277745 is about 80294.9422130684. The cubic root of 6447277745 is about 1861.1960689720.

The spelling of 6447277745 in words is "six billion, four hundred forty-seven million, two hundred seventy-seven thousand, seven hundred forty-five".