18885033487 has 2 divisors, whose sum is σ = 18885033488. Its totient is φ = 18885033486.

The previous prime is 18885033449. The next prime is 18885033521. The reversal of 18885033487 is 78433058881.

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-18885033487 is a prime.

It is a super-2 number, since 2×18885033487² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18885333487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442516743 + 9442516744.

It is an arithmetic number, because the mean of its divisors is an integer number (9442516744).

Almost surely, 2^18885033487 is an apocalyptic number.

18885033487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885033487 is an equidigital number, since it uses as much as digits as its factorization.

18885033487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 18885033487 in words is "eighteen billion, eight hundred eighty-five million, thirty-three thousand, four hundred eighty-seven".