1668717416 has 16 divisors (see below), whose sum is σ = 3312895140. Its totient is φ = 785278720.

The previous prime is 1668717409. The next prime is 1668717511. The reversal of 1668717416 is 6147178661.

It can be written as a sum of positive squares in 2 ways, for example, as 1463368516 + 205348900 = 38254^2 + 14330^2 .

It is an unprimeable number.

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, 6134855 + ... + 6135126.

Almost surely, 2^1668717416 is an apocalyptic number.

It is an amenable number.

1668717416 is a deficient number, since it is larger than the sum of its proper divisors (1644177724).

1668717416 is a wasteful number, since it uses less digits than its factorization.

1668717416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12270004 (or 12270000 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 1668717416 is about 40849.9377722904. The cubic root of 1668717416 is about 1186.1171886208.

The spelling of 1668717416 in words is "one billion, six hundred sixty-eight million, seven hundred seventeen thousand, four hundred sixteen".