63503681866 has 8 divisors (see below), whose sum is σ = 100858788900. Its totient is φ = 29884085568.

The previous prime is 63503681863. The next prime is 63503681911. The reversal of 63503681866 is 66818630536.

It can be written as a sum of positive squares in 2 ways, for example, as 47729577841 + 15774104025 = 218471^2 + 125595^2 .

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

It is a super-2 number, since 2×63503681866² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63503681861) 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 3 ways as a sum of consecutive naturals, for example, 933877641 + ... + 933877708.

Almost surely, 2^63503681866 is an apocalyptic number.

63503681866 is a deficient number, since it is larger than the sum of its proper divisors (37355107034).

63503681866 is a wasteful number, since it uses less digits than its factorization.

63503681866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867755368.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 63503681866 in words is "sixty-three billion, five hundred three million, six hundred eighty-one thousand, eight hundred sixty-six".