1668885172 has 12 divisors (see below), whose sum is σ = 3092346180. Its totient is φ = 785357696.

The previous prime is 1668885167. The next prime is 1668885181. The reversal of 1668885172 is 2715888661.

It can be written as a sum of positive squares in 2 ways, for example, as 485937936 + 1182947236 = 22044^2 + 34394^2 .

It is a congruent number.

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, 12271147 + ... + 12271282.

It is an arithmetic number, because the mean of its divisors is an integer number (257695515).

Almost surely, 2^1668885172 is an apocalyptic number.

It is an amenable number.

1668885172 is a deficient number, since it is larger than the sum of its proper divisors (1423461008).

1668885172 is a wasteful number, since it uses less digits than its factorization.

1668885172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24542450 (or 24542448 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 52.

The square root of 1668885172 is about 40851.9910408293. The cubic root of 1668885172 is about 1186.1569340376.

The spelling of 1668885172 in words is "one billion, six hundred sixty-eight million, eight hundred eighty-five thousand, one hundred seventy-two".