663899998365 has 12 divisors (see below), whose sum is σ = 1150759997244. Its totient is φ = 354079999104.

The previous prime is 663899998351. The next prime is 663899998373. The reversal of 663899998365 is 563899998366.

663899998365 is a `hidden beast` number, since 6 + 6 + 3 + 89 + 99 + 98 + 365 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 280335304089 + 383564694276 = 529467^2 + 619326^2 .

It is not a de Polignac number, because 663899998365 - 2⁸ = 663899998109 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7376666604 + ... + 7376666693.

It is an arithmetic number, because the mean of its divisors is an integer number (95896666437).

Almost surely, 2^663899998365 is an apocalyptic number.

It is an amenable number.

663899998365 is a deficient number, since it is larger than the sum of its proper divisors (486859998879).

663899998365 is a wasteful number, since it uses less digits than its factorization.

663899998365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14753333308 (or 14753333305 counting only the distinct ones).

The product of its digits is 4081466880, while the sum is 81.

Subtracting from 663899998365 its reverse (563899998366), we obtain a palindrome (99999999999).

The spelling of 663899998365 in words is "six hundred sixty-three billion, eight hundred ninety-nine million, nine hundred ninety-eight thousand, three hundred sixty-five".