18416851663 has 32 divisors (see below), whose sum is σ = 22226918400. Its totient is φ = 14918830080.

The previous prime is 18416851591. The next prime is 18416851669. The reversal of 18416851663 is 36615861481.

It is a de Polignac number, because none of the positive numbers 2^k-18416851663 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 (18416851669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7733733 + ... + 7736113.

It is an arithmetic number, because the mean of its divisors is an integer number (694591200).

Almost surely, 2^18416851663 is an apocalyptic number.

18416851663 is a deficient number, since it is larger than the sum of its proper divisors (3810066737).

18416851663 is a wasteful number, since it uses less digits than its factorization.

18416851663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967.

The product of its digits is 829440, while the sum is 49.

The spelling of 18416851663 in words is "eighteen billion, four hundred sixteen million, eight hundred fifty-one thousand, six hundred sixty-three".