663646525646366 has 8 divisors (see below), whose sum is σ = 995479663386744. Its totient is φ = 331819971184120.

The previous prime is 663646525646347. The next prime is 663646525646381.

It is a happy number.

663646525646366 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×663646525646366² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 663646525646293 and 663646525646302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645567505 + ... + 1645970748.

It is an arithmetic number, because the mean of its divisors is an integer number (124434957923343).

Almost surely, 2^{663646525646366} is an apocalyptic number.

663646525646366 is a deficient number, since it is larger than the sum of its proper divisors (331833137740378).

663646525646366 is a wasteful number, since it uses less digits than its factorization.

663646525646366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291639066.

The product of its digits is 12093235200, while the sum is 74.

The spelling of 663646525646366 in words is "six hundred sixty-three trillion, six hundred forty-six billion, five hundred twenty-five million, six hundred forty-six thousand, three hundred sixty-six".