12663491806 has 16 divisors (see below), whose sum is σ = 21734737920. Its totient is φ = 5420737080.

The previous prime is 12663491803. The next prime is 12663491821. The reversal of 12663491806 is 60819436621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12663491801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527310 + ... + 550801.

It is an arithmetic number, because the mean of its divisors is an integer number (1358421120).

Almost surely, 2^12663491806 is an apocalyptic number.

12663491806 is a deficient number, since it is larger than the sum of its proper divisors (9071246114).

12663491806 is a wasteful number, since it uses less digits than its factorization.

12663491806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078959.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 12663491806 in words is "twelve billion, six hundred sixty-three million, four hundred ninety-one thousand, eight hundred six".