1668342138471 has 16 divisors (see below), whose sum is σ = 2478139417600. Its totient is φ = 1109293446744.

The previous prime is 1668342138457. The next prime is 1668342138499. The reversal of 1668342138471 is 1748312438661.

1668342138471 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 34 + 2 + 138 + 471 = 666.

It is not a de Polignac number, because 1668342138471 - 2⁵ = 1668342138439 is a prime.

It is a super-3 number, since 3×1668342138471³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668342138431) 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 15 ways as a sum of consecutive naturals, for example, 81507511 + ... + 81527976.

It is an arithmetic number, because the mean of its divisors is an integer number (154883713600).

Almost surely, 2^{1668342138471} is an apocalyptic number.

1668342138471 is a deficient number, since it is larger than the sum of its proper divisors (809797279129).

1668342138471 is a wasteful number, since it uses less digits than its factorization.

1668342138471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163035875 (or 163035869 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 1668342138471 in words is "one trillion, six hundred sixty-eight billion, three hundred forty-two million, one hundred thirty-eight thousand, four hundred seventy-one".