18668355011 has 2 divisors, whose sum is σ = 18668355012. Its totient is φ = 18668355010.

The previous prime is 18668355001. The next prime is 18668355073. The reversal of 18668355011 is 11055386681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18668355011 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18668355001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334177505 + 9334177506.

It is an arithmetic number, because the mean of its divisors is an integer number (9334177506).

Almost surely, 2^18668355011 is an apocalyptic number.

18668355011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18668355011 is an equidigital number, since it uses as much as digits as its factorization.

18668355011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 18668355011 in words is "eighteen billion, six hundred sixty-eight million, three hundred fifty-five thousand, eleven".