16781640539 has 2 divisors, whose sum is σ = 16781640540. Its totient is φ = 16781640538.

The previous prime is 16781640527. The next prime is 16781640563. The reversal of 16781640539 is 93504618761.

16781640539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16781640539 is a prime.

It is not a weakly prime, because it can be changed into another prime (16781640739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8390820269 + 8390820270.

It is an arithmetic number, because the mean of its divisors is an integer number (8390820270).

Almost surely, 2^16781640539 is an apocalyptic number.

16781640539 is a deficient number, since it is larger than the sum of its proper divisors (1).

16781640539 is an equidigital number, since it uses as much as digits as its factorization.

16781640539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 16781640539 in words is "sixteen billion, seven hundred eighty-one million, six hundred forty thousand, five hundred thirty-nine".