16540375009 has 2 divisors, whose sum is σ = 16540375010. Its totient is φ = 16540375008.

The previous prime is 16540374979. The next prime is 16540375051. The reversal of 16540375009 is 90057304561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16391168784 + 149206225 = 128028^2 + 12215^2 .

It is a cyclic number.

It is not a de Polignac number, because 16540375009 - 2⁷ = 16540374881 is a prime.

It is not a weakly prime, because it can be changed into another prime (16540375109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8270187504 + 8270187505.

It is an arithmetic number, because the mean of its divisors is an integer number (8270187505).

Almost surely, 2^16540375009 is an apocalyptic number.

It is an amenable number.

16540375009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16540375009 is an equidigital number, since it uses as much as digits as its factorization.

16540375009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 16540375009 in words is "sixteen billion, five hundred forty million, three hundred seventy-five thousand, nine".