1666843364 has 6 divisors (see below), whose sum is σ = 2916975894. Its totient is φ = 833421680.

The previous prime is 1666843351. The next prime is 1666843403. The reversal of 1666843364 is 4633486661.

It can be written as a sum of positive squares in only one way, i.e., 1663987264 + 2856100 = 40792^2 + 1690^2 .

It is a super-2 number, since 2×1666843364² = 5556733600221672992, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208355417 + ... + 208355424.

It is an arithmetic number, because the mean of its divisors is an integer number (486162649).

Almost surely, 2^1666843364 is an apocalyptic number.

It is an amenable number.

1666843364 is a deficient number, since it is larger than the sum of its proper divisors (1250132530).

1666843364 is a wasteful number, since it uses less digits than its factorization.

1666843364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416710845 (or 416710843 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 47.

The square root of 1666843364 is about 40826.9930805588. The cubic root of 1666843364 is about 1185.6729995869.

The spelling of 1666843364 in words is "one billion, six hundred sixty-six million, eight hundred forty-three thousand, three hundred sixty-four".