1668407345 has 16 divisors (see below), whose sum is σ = 2214864000. Its totient is φ = 1196294400.

The previous prime is 1668407311. The next prime is 1668407357. The reversal of 1668407345 is 5437048661.

It is not a de Polignac number, because 1668407345 - 2⁸ = 1668407089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668407296 and 1668407305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209720 + ... + 217529.

It is an arithmetic number, because the mean of its divisors is an integer number (138429000).

Almost surely, 2^1668407345 is an apocalyptic number.

It is an amenable number.

1668407345 is a deficient number, since it is larger than the sum of its proper divisors (546456655).

1668407345 is a wasteful number, since it uses less digits than its factorization.

1668407345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427336.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 1668407345 is about 40846.1423515122. The cubic root of 1668407345 is about 1186.0437183573.

The spelling of 1668407345 in words is "one billion, six hundred sixty-eight million, four hundred seven thousand, three hundred forty-five".