18806611 has 2 divisors, whose sum is σ = 18806612. Its totient is φ = 18806610.

The previous prime is 18806603. The next prime is 18806621. The reversal of 18806611 is 11660881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18806611 - 2³ = 18806603 is a prime.

It is not a weakly prime, because it can be changed into another prime (18806621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9403305 + 9403306.

It is an arithmetic number, because the mean of its divisors is an integer number (9403306).

Almost surely, 2^18806611 is an apocalyptic number.

18806611 is a deficient number, since it is larger than the sum of its proper divisors (1).

18806611 is an equidigital number, since it uses as much as digits as its factorization.

18806611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18806611 is about 4336.6589674541. The cubic root of 18806611 is about 265.9317432795.

The spelling of 18806611 in words is "eighteen million, eight hundred six thousand, six hundred eleven".