1668185672 has 8 divisors (see below), whose sum is σ = 3127848150. Its totient is φ = 834092832.

The previous prime is 1668185599. The next prime is 1668185677. The reversal of 1668185672 is 2765818661.

It can be written as a sum of positive squares in only one way, i.e., 1107159076 + 561026596 = 33274^2 + 23686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1668185672.

It is not an unprimeable number, because it can be changed into a prime (1668185677) by changing a digit.

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 as a sum of consecutive naturals, namely, 104261597 + ... + 104261612.

Almost surely, 2^1668185672 is an apocalyptic number.

It is an amenable number.

1668185672 is a deficient number, since it is larger than the sum of its proper divisors (1459662478).

1668185672 is a wasteful number, since it uses less digits than its factorization.

1668185672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208523215 (or 208523211 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 1668185672 is about 40843.4287493105. The cubic root of 1668185672 is about 1185.9911881174.

The spelling of 1668185672 in words is "one billion, six hundred sixty-eight million, one hundred eighty-five thousand, six hundred seventy-two".