18186380287 has 2 divisors, whose sum is σ = 18186380288. Its totient is φ = 18186380286.

The previous prime is 18186380273. The next prime is 18186380339. The reversal of 18186380287 is 78208368181.

It is a happy number.

It is an a-pointer prime, because the next prime (18186380339) can be obtained adding 18186380287 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18186380287 - 2⁷ = 18186380159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18186380227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093190143 + 9093190144.

It is an arithmetic number, because the mean of its divisors is an integer number (9093190144).

Almost surely, 2^18186380287 is an apocalyptic number.

18186380287 is a deficient number, since it is larger than the sum of its proper divisors (1).

18186380287 is an equidigital number, since it uses as much as digits as its factorization.

18186380287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 18186380287 in words is "eighteen billion, one hundred eighty-six million, three hundred eighty thousand, two hundred eighty-seven".