1666708672 has 28 divisors (see below), whose sum is σ = 3309880096. Its totient is φ = 832723200.

The previous prime is 1666708669. The next prime is 1666708721. The reversal of 1666708672 is 2768076661.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81922 + ... + 100222.

Almost surely, 2^1666708672 is an apocalyptic number.

It is an amenable number.

1666708672 is a deficient number, since it is larger than the sum of its proper divisors (1643171424).

1666708672 is a wasteful number, since it uses less digits than its factorization.

1666708672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19736 (or 19726 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 1666708672 is about 40825.3435013106. The cubic root of 1666708672 is about 1185.6410619789.

The spelling of 1666708672 in words is "one billion, six hundred sixty-six million, seven hundred eight thousand, six hundred seventy-two".