16987538489 has 2 divisors, whose sum is σ = 16987538490. Its totient is φ = 16987538488.

The previous prime is 16987538459. The next prime is 16987538497. The reversal of 16987538489 is 98483578961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11542279225 + 5445259264 = 107435^2 + 73792^2 .

It is a cyclic number.

It is not a de Polignac number, because 16987538489 - 2⁸ = 16987538233 is a prime.

It is a super-3 number, since 3×16987538489³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16987538459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8493769244 + 8493769245.

It is an arithmetic number, because the mean of its divisors is an integer number (8493769245).

Almost surely, 2^16987538489 is an apocalyptic number.

It is an amenable number.

16987538489 is a deficient number, since it is larger than the sum of its proper divisors (1).

16987538489 is an equidigital number, since it uses as much as digits as its factorization.

16987538489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104509440, while the sum is 68.

The spelling of 16987538489 in words is "sixteen billion, nine hundred eighty-seven million, five hundred thirty-eight thousand, four hundred eighty-nine".