12816661806 has 32 divisors (see below), whose sum is σ = 30672354720. Its totient is φ = 3943588032.

The previous prime is 12816661799. The next prime is 12816661813. The reversal of 12816661806 is 60816661821.

It is an interprime number because it is at equal distance from previous prime (12816661799) and next prime (12816661813).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9127975 + ... + 9129378.

It is an arithmetic number, because the mean of its divisors is an integer number (958511085).

Almost surely, 2^12816661806 is an apocalyptic number.

12816661806 is an abundant number, since it is smaller than the sum of its proper divisors (17855692914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12816661806 is a wasteful number, since it uses less digits than its factorization.

12816661806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18257377 (or 18257371 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 12816661806 in words is "twelve billion, eight hundred sixteen million, six hundred sixty-one thousand, eight hundred six".