18933509087 has 2 divisors, whose sum is σ = 18933509088. Its totient is φ = 18933509086.

The previous prime is 18933509041. The next prime is 18933509099. The reversal of 18933509087 is 78090533981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18933509087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18933500087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9466754543 + 9466754544.

It is an arithmetic number, because the mean of its divisors is an integer number (9466754544).

Almost surely, 2^18933509087 is an apocalyptic number.

18933509087 is a deficient number, since it is larger than the sum of its proper divisors (1).

18933509087 is an equidigital number, since it uses as much as digits as its factorization.

18933509087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 18933509087 in words is "eighteen billion, nine hundred thirty-three million, five hundred nine thousand, eighty-seven".