663945779 has 8 divisors (see below), whose sum is σ = 769483008. Its totient is φ = 561080520.

The previous prime is 663945773. The next prime is 663945791. The reversal of 663945779 is 977549366.

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

It is not a de Polignac number, because 663945779 - 2¹² = 663941683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663945773) 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, 667457 + ... + 668450.

It is an arithmetic number, because the mean of its divisors is an integer number (96185376).

Almost surely, 2^663945779 is an apocalyptic number.

663945779 is a deficient number, since it is larger than the sum of its proper divisors (105537229).

663945779 is a wasteful number, since it uses less digits than its factorization.

663945779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335985.

The product of its digits is 8573040, while the sum is 56.

The square root of 663945779 is about 25767.1453405301. The cubic root of 663945779 is about 872.3903870749.

The spelling of 663945779 in words is "six hundred sixty-three million, nine hundred forty-five thousand, seven hundred seventy-nine".