1680765865 has 16 divisors (see below), whose sum is σ = 2034691200. Its totient is φ = 1332817920.

The previous prime is 1680765833. The next prime is 1680765869. The reversal of 1680765865 is 5685670861.

It is not a de Polignac number, because 1680765865 - 2⁵ = 1680765833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680765869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268036 + ... + 274234.

It is an arithmetic number, because the mean of its divisors is an integer number (127168200).

Almost surely, 2^1680765865 is an apocalyptic number.

It is an amenable number.

1680765865 is a deficient number, since it is larger than the sum of its proper divisors (353925335).

1680765865 is a wasteful number, since it uses less digits than its factorization.

1680765865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The square root of 1680765865 is about 40997.1445956911. The cubic root of 1680765865 is about 1188.9650076246.

The spelling of 1680765865 in words is "one billion, six hundred eighty million, seven hundred sixty-five thousand, eight hundred sixty-five".