1668971349 has 6 divisors (see below), whose sum is σ = 2410736406. Its totient is φ = 1112647560.

The previous prime is 1668971303. The next prime is 1668971351. The reversal of 1668971349 is 9431798661.

It can be written as a sum of positive squares in only one way, i.e., 1538600625 + 130370724 = 39225^2 + 11418^2 .

It is not a de Polignac number, because 1668971349 - 2¹¹ = 1668969301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668971295 and 1668971304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668971449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92720622 + ... + 92720639.

It is an arithmetic number, because the mean of its divisors is an integer number (401789401).

Almost surely, 2^1668971349 is an apocalyptic number.

It is an amenable number.

1668971349 is a deficient number, since it is larger than the sum of its proper divisors (741765057).

1668971349 is a wasteful number, since it uses less digits than its factorization.

1668971349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185441267 (or 185441264 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1668971349 is about 40853.0457738465. The cubic root of 1668971349 is about 1186.1773503987.

The spelling of 1668971349 in words is "one billion, six hundred sixty-eight million, nine hundred seventy-one thousand, three hundred forty-nine".