663886121986 has 16 divisors (see below), whose sum is σ = 1017048545280. Its totient is φ = 324870377920.

The previous prime is 663886121971. The next prime is 663886122001. The reversal of 663886121986 is 689121688366.

It is an interprime number because it is at equal distance from previous prime (663886121971) and next prime (663886122001).

It is a super-2 number, since 2×663886121986² (a number of 24 digits) contains 22 as substring.

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, 3610026 + ... + 3789466.

It is an arithmetic number, because the mean of its divisors is an integer number (63565534080).

Almost surely, 2^663886121986 is an apocalyptic number.

663886121986 is a deficient number, since it is larger than the sum of its proper divisors (353162423294).

663886121986 is a wasteful number, since it uses less digits than its factorization.

663886121986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218849.

The product of its digits is 35831808, while the sum is 64.

The spelling of 663886121986 in words is "six hundred sixty-three billion, eight hundred eighty-six million, one hundred twenty-one thousand, nine hundred eighty-six".