1680347811 has 4 divisors (see below), whose sum is σ = 2240463752. Its totient is φ = 1120231872.

The previous prime is 1680347797. The next prime is 1680347819. The reversal of 1680347811 is 1187430861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1187430861 = 3 ⋅395810287.

It is not a de Polignac number, because 1680347811 - 2⁹ = 1680347299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1680347811.

It is not an unprimeable number, because it can be changed into a prime (1680347819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280057966 + ... + 280057971.

It is an arithmetic number, because the mean of its divisors is an integer number (560115938).

Almost surely, 2^1680347811 is an apocalyptic number.

1680347811 is a deficient number, since it is larger than the sum of its proper divisors (560115941).

1680347811 is an equidigital number, since it uses as much as digits as its factorization.

1680347811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560115940.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 1680347811 is about 40992.0457040143. The cubic root of 1680347811 is about 1188.8664230441.

The spelling of 1680347811 in words is "one billion, six hundred eighty million, three hundred forty-seven thousand, eight hundred eleven".