16840657344839 has 2 divisors, whose sum is σ = 16840657344840. Its totient is φ = 16840657344838.

The previous prime is 16840657344821. The next prime is 16840657344949. The reversal of 16840657344839 is 93844375604861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16840657344839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16840657304839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8420328672419 + 8420328672420.

It is an arithmetic number, because the mean of its divisors is an integer number (8420328672420).

Almost surely, 2^{16840657344839} is an apocalyptic number.

16840657344839 is a deficient number, since it is larger than the sum of its proper divisors (1).

16840657344839 is an equidigital number, since it uses as much as digits as its factorization.

16840657344839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 418037760, while the sum is 68.

The spelling of 16840657344839 in words is "sixteen trillion, eight hundred forty billion, six hundred fifty-seven million, three hundred forty-four thousand, eight hundred thirty-nine".