18812663 has 2 divisors, whose sum is σ = 18812664. Its totient is φ = 18812662.

The previous prime is 18812627. The next prime is 18812671. The reversal of 18812663 is 36621881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18812663 - 2²⁴ = 2035447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18812623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406331 + 9406332.

It is an arithmetic number, because the mean of its divisors is an integer number (9406332).

Almost surely, 2^18812663 is an apocalyptic number.

18812663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18812663 is an equidigital number, since it uses as much as digits as its factorization.

18812663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 18812663 is about 4337.3566835113. The cubic root of 18812663 is about 265.9602659854.

The spelling of 18812663 in words is "eighteen million, eight hundred twelve thousand, six hundred sixty-three".