663686365 has 8 divisors (see below), whose sum is σ = 796669920. Its totient is φ = 530784912.

The previous prime is 663686351. The next prime is 663686369. The reversal of 663686365 is 563686366.

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

It is a cyclic number.

It is not a de Polignac number, because 663686365 - 2¹⁵ = 663653597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663686369) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1059 + ... + 36448.

It is an arithmetic number, because the mean of its divisors is an integer number (99583740).

Almost surely, 2^663686365 is an apocalyptic number.

It is an amenable number.

663686365 is a deficient number, since it is larger than the sum of its proper divisors (132983555).

663686365 is a wasteful number, since it uses less digits than its factorization.

663686365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41051.

The product of its digits is 2799360, while the sum is 49.

The square root of 663686365 is about 25762.1110353946. Note that the first 3 decimals coincide. The cubic root of 663686365 is about 872.2767534180.

Subtracting from 663686365 its reverse (563686366), we obtain a palindrome (99999999).

The spelling of 663686365 in words is "six hundred sixty-three million, six hundred eighty-six thousand, three hundred sixty-five".