663784888346999 has 16 divisors (see below), whose sum is σ = 709131517347840. Its totient is φ = 619953317676000.

The previous prime is 663784888346947. The next prime is 663784888347037. The reversal of 663784888346999 is 999643888487366.

It is a cyclic number.

It is not a de Polignac number, because 663784888346999 - 2³² = 663780593379703 is a prime.

It is a super-2 number, since 2×663784888346999² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663784888346939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157671257 + ... + 161826434.

It is an arithmetic number, because the mean of its divisors is an integer number (44320719834240).

Almost surely, 2^{663784888346999} is an apocalyptic number.

663784888346999 is a deficient number, since it is larger than the sum of its proper divisors (45346629000841).

663784888346999 is a wasteful number, since it uses less digits than its factorization.

663784888346999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319500062.

The product of its digits is 650132324352, while the sum is 98.

The spelling of 663784888346999 in words is "six hundred sixty-three trillion, seven hundred eighty-four billion, eight hundred eighty-eight million, three hundred forty-six thousand, nine hundred ninety-nine".