188728385243987 has 2 divisors, whose sum is σ = 188728385243988. Its totient is φ = 188728385243986.

The previous prime is 188728385243969. The next prime is 188728385244079. The reversal of 188728385243987 is 789342583827881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 188728385243987 - 2³² = 188724090276691 is a prime.

It is not a weakly prime, because it can be changed into another prime (188728385243087) 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, 94364192621993 + 94364192621994.

It is an arithmetic number, because the mean of its divisors is an integer number (94364192621994).

Almost surely, 2^{188728385243987} is an apocalyptic number.

188728385243987 is a deficient number, since it is larger than the sum of its proper divisors (1).

188728385243987 is an equidigital number, since it uses as much as digits as its factorization.

188728385243987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10404495360, while the sum is 83.

The spelling of 188728385243987 in words is "one hundred eighty-eight trillion, seven hundred twenty-eight billion, three hundred eighty-five million, two hundred forty-three thousand, nine hundred eighty-seven".