16513126543987 has 2 divisors, whose sum is σ = 16513126543988. Its totient is φ = 16513126543986.

The previous prime is 16513126543967. The next prime is 16513126544017. The reversal of 16513126543987 is 78934562131561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16513126543987 is a prime.

It is not a weakly prime, because it can be changed into another prime (16513126543957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256563271993 + 8256563271994.

It is an arithmetic number, because the mean of its divisors is an integer number (8256563271994).

Almost surely, 2^{16513126543987} is an apocalyptic number.

16513126543987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16513126543987 is an equidigital number, since it uses as much as digits as its factorization.

16513126543987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 61.

The spelling of 16513126543987 in words is "sixteen trillion, five hundred thirteen billion, one hundred twenty-six million, five hundred forty-three thousand, nine hundred eighty-seven".