18806165663 has 8 divisors (see below), whose sum is σ = 19915078608. Its totient is φ = 17697549184.

The previous prime is 18806165621. The next prime is 18806165669. The reversal of 18806165663 is 36656160881.

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

It is a cyclic number.

It is not a de Polignac number, because 18806165663 - 2¹² = 18806161567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18806165669) 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, 63845 + ... + 204177.

It is an arithmetic number, because the mean of its divisors is an integer number (2489384826).

Almost surely, 2^18806165663 is an apocalyptic number.

18806165663 is a deficient number, since it is larger than the sum of its proper divisors (1108912945).

18806165663 is a wasteful number, since it uses less digits than its factorization.

18806165663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148233.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 18806165663 in words is "eighteen billion, eight hundred six million, one hundred sixty-five thousand, six hundred sixty-three".