1668888692 has 6 divisors (see below), whose sum is σ = 2920555218. Its totient is φ = 834444344.

The previous prime is 1668888679. The next prime is 1668888733. The reversal of 1668888692 is 2968888661.

It can be written as a sum of positive squares in only one way, i.e., 1239321616 + 429567076 = 35204^2 + 20726^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208611083 + ... + 208611090.

It is an arithmetic number, because the mean of its divisors is an integer number (486759203).

Almost surely, 2^1668888692 is an apocalyptic number.

It is an amenable number.

1668888692 is a deficient number, since it is larger than the sum of its proper divisors (1251666526).

1668888692 is a wasteful number, since it uses less digits than its factorization.

1668888692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417222177 (or 417222175 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 62.

The square root of 1668888692 is about 40852.0341231621. The cubic root of 1668888692 is about 1186.1577679814.

The spelling of 1668888692 in words is "one billion, six hundred sixty-eight million, eight hundred eighty-eight thousand, six hundred ninety-two".