18288990787 has 2 divisors, whose sum is σ = 18288990788. Its totient is φ = 18288990786.

The previous prime is 18288990773. The next prime is 18288990791. The reversal of 18288990787 is 78709988281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18288990787 is a prime.

It is not a weakly prime, because it can be changed into another prime (18288990757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9144495393 + 9144495394.

It is an arithmetic number, because the mean of its divisors is an integer number (9144495394).

Almost surely, 2^18288990787 is an apocalyptic number.

18288990787 is a deficient number, since it is larger than the sum of its proper divisors (1).

18288990787 is an equidigital number, since it uses as much as digits as its factorization.

18288990787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32514048, while the sum is 67.

The spelling of 18288990787 in words is "eighteen billion, two hundred eighty-eight million, nine hundred ninety thousand, seven hundred eighty-seven".