16840657344947 has 4 divisors (see below), whose sum is σ = 16851097927680. Its totient is φ = 16830216762216.

The previous prime is 16840657344839. The next prime is 16840657344949. The reversal of 16840657344947 is 74944375604861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16840657344947 - 2³⁰ = 16839583603123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16840657344949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5220288947 + ... + 5220292172.

It is an arithmetic number, because the mean of its divisors is an integer number (4212774481920).

Almost surely, 2^{16840657344947} is an apocalyptic number.

16840657344947 is a deficient number, since it is larger than the sum of its proper divisors (10440582733).

16840657344947 is a wasteful number, since it uses less digits than its factorization.

16840657344947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440582732.

The product of its (nonzero) digits is 487710720, while the sum is 68.

The spelling of 16840657344947 in words is "sixteen trillion, eight hundred forty billion, six hundred fifty-seven million, three hundred forty-four thousand, nine hundred forty-seven".