6645077849 has 4 divisors (see below), whose sum is σ = 6678470400. Its totient is φ = 6611685300.

The previous prime is 6645077839. The next prime is 6645077851. The reversal of 6645077849 is 9487705466.

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 6645077849 - 2⁴ = 6645077833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6645077794 and 6645077803.

It is not an unprimeable number, because it can be changed into a prime (6645077839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16695977 + ... + 16696374.

It is an arithmetic number, because the mean of its divisors is an integer number (1669617600).

Almost surely, 2^6645077849 is an apocalyptic number.

It is an amenable number.

6645077849 is a deficient number, since it is larger than the sum of its proper divisors (33392551).

6645077849 is a wasteful number, since it uses less digits than its factorization.

6645077849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33392550.

The product of its (nonzero) digits is 10160640, while the sum is 56.

The square root of 6645077849 is about 81517.3469207628. The cubic root of 6645077849 is about 1880.0382753072.

The spelling of 6645077849 in words is "six billion, six hundred forty-five million, seventy-seven thousand, eight hundred forty-nine".