1680847811 has 4 divisors (see below), whose sum is σ = 1681012800. Its totient is φ = 1680682824.

The previous prime is 1680847799. The next prime is 1680847813. The reversal of 1680847811 is 1187480861.

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 1680847811 - 2¹⁸ = 1680585667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680847813) 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 in 3 ways as a sum of consecutive naturals, for example, 66131 + ... + 87948.

It is an arithmetic number, because the mean of its divisors is an integer number (420253200).

Almost surely, 2^1680847811 is an apocalyptic number.

1680847811 is a deficient number, since it is larger than the sum of its proper divisors (164989).

1680847811 is a wasteful number, since it uses less digits than its factorization.

1680847811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164988.

The product of its (nonzero) digits is 86016, while the sum is 44.

The square root of 1680847811 is about 40998.1439945761. The cubic root of 1680847811 is about 1188.9843300350.

The spelling of 1680847811 in words is "one billion, six hundred eighty million, eight hundred forty-seven thousand, eight hundred eleven".