18987936552503 has 2 divisors, whose sum is σ = 18987936552504. Its totient is φ = 18987936552502.

The previous prime is 18987936552451. The next prime is 18987936552523. The reversal of 18987936552503 is 30525563978981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18987936552503 - 2¹² = 18987936548407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18987936552523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493968276251 + 9493968276252.

It is an arithmetic number, because the mean of its divisors is an integer number (9493968276252).

Almost surely, 2^{18987936552503} is an apocalyptic number.

18987936552503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18987936552503 is an equidigital number, since it uses as much as digits as its factorization.

18987936552503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888000, while the sum is 71.

The spelling of 18987936552503 in words is "eighteen trillion, nine hundred eighty-seven billion, nine hundred thirty-six million, five hundred fifty-two thousand, five hundred three".