1668971684 has 6 divisors (see below), whose sum is σ = 2920700454. Its totient is φ = 834485840.

The previous prime is 1668971683. The next prime is 1668971729. The reversal of 1668971684 is 4861798661.

It can be written as a sum of positive squares in only one way, i.e., 978438400 + 690533284 = 31280^2 + 26278^2 .

It is not an unprimeable number, because it can be changed into a prime (1668971683) 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, 208621457 + ... + 208621464.

It is an arithmetic number, because the mean of its divisors is an integer number (486783409).

Almost surely, 2^1668971684 is an apocalyptic number.

It is an amenable number.

1668971684 is a deficient number, since it is larger than the sum of its proper divisors (1251728770).

1668971684 is a wasteful number, since it uses less digits than its factorization.

1668971684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417242925 (or 417242923 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 56.

The square root of 1668971684 is about 40853.0498739078. The cubic root of 1668971684 is about 1186.1774297628.

The spelling of 1668971684 in words is "one billion, six hundred sixty-eight million, nine hundred seventy-one thousand, six hundred eighty-four".