668060865 has 20 divisors (see below), whose sum is σ = 1197561684. Its totient is φ = 356298912.

The previous prime is 668060851. The next prime is 668060923. The reversal of 668060865 is 568060866.

668060865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 400640256 + 267420609 = 20016^2 + 16353^2 .

It is not a de Polignac number, because 668060865 - 2⁶ = 668060801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 668060865.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 824362 + ... + 825171.

Almost surely, 2^668060865 is an apocalyptic number.

It is an amenable number.

668060865 is a deficient number, since it is larger than the sum of its proper divisors (529500819).

668060865 is a wasteful number, since it uses less digits than its factorization.

668060865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649550 (or 1649541 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 668060865 is about 25846.8734085963. The cubic root of 668060865 is about 874.1890129288.

Subtracting from 668060865 its reverse (568060866), we obtain a palindrome (99999999).

The spelling of 668060865 in words is "six hundred sixty-eight million, sixty thousand, eight hundred sixty-five".