663863870 has 16 divisors (see below), whose sum is σ = 1215209520. Its totient is φ = 261044544.

The previous prime is 663863867. The next prime is 663863887. The reversal of 663863870 is 78368366.

663863870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562007 + ... + 563186.

It is an arithmetic number, because the mean of its divisors is an integer number (75950595).

Almost surely, 2^663863870 is an apocalyptic number.

663863870 is a deficient number, since it is larger than the sum of its proper divisors (551345650).

663863870 is a wasteful number, since it uses less digits than its factorization.

663863870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125259.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 663863870 is about 25765.5558837763. Note that the first 3 decimals coincide. The cubic root of 663863870 is about 872.3545108708.

The spelling of 663863870 in words is "six hundred sixty-three million, eight hundred sixty-three thousand, eight hundred seventy".