1664213342686 has 8 divisors (see below), whose sum is σ = 2496340296000. Its totient is φ = 832099910688.

The previous prime is 1664213342611. The next prime is 1664213342713. The reversal of 1664213342686 is 6862433124661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3066811 + ... + 3568438.

It is an arithmetic number, because the mean of its divisors is an integer number (312042537000).

Almost surely, 2^{1664213342686} is an apocalyptic number.

1664213342686 is a deficient number, since it is larger than the sum of its proper divisors (832126953314).

1664213342686 is a wasteful number, since it uses less digits than its factorization.

1664213342686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6760658.

The product of its digits is 5971968, while the sum is 52.

The spelling of 1664213342686 in words is "one trillion, six hundred sixty-four billion, two hundred thirteen million, three hundred forty-two thousand, six hundred eighty-six".