18663976673 has 2 divisors, whose sum is σ = 18663976674. Its totient is φ = 18663976672.

The previous prime is 18663976627. The next prime is 18663976693. The reversal of 18663976673 is 37667936681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18613963489 + 50013184 = 136433^2 + 7072^2 .

It is a cyclic number.

It is not a de Polignac number, because 18663976673 - 2¹⁶ = 18663911137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18663976603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9331988336 + 9331988337.

It is an arithmetic number, because the mean of its divisors is an integer number (9331988337).

Almost surely, 2^18663976673 is an apocalyptic number.

It is an amenable number.

18663976673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18663976673 is an equidigital number, since it uses as much as digits as its factorization.

18663976673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 62.

The spelling of 18663976673 in words is "eighteen billion, six hundred sixty-three million, nine hundred seventy-six thousand, six hundred seventy-three".