6663779 has 4 divisors (see below), whose sum is σ = 7055784. Its totient is φ = 6271776.

The previous prime is 6663763. The next prime is 6663793. The reversal of 6663779 is 9773666.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6663779 - 2⁴ = 6663763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6663739) 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 3 ways as a sum of consecutive naturals, for example, 195977 + ... + 196010.

It is an arithmetic number, because the mean of its divisors is an integer number (1763946).

Almost surely, 2^6663779 is an apocalyptic number.

6663779 is a deficient number, since it is larger than the sum of its proper divisors (392005).

6663779 is a wasteful number, since it uses less digits than its factorization.

6663779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392004.

The product of its digits is 285768, while the sum is 44.

The square root of 6663779 is about 2581.4296426593. The cubic root of 6663779 is about 188.1800278681.

The spelling of 6663779 in words is "six million, six hundred sixty-three thousand, seven hundred seventy-nine".