1666666584 has 192 divisors, whose sum is σ = 5210620800. Its totient is φ = 492972480.

The previous prime is 1666666559. The next prime is 1666666597. The reversal of 1666666584 is 4856666661.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1666666584.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1123107 + ... + 1124589.

It is an arithmetic number, because the mean of its divisors is an integer number (27138650).

Almost surely, 2^1666666584 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666666584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2605310400).

1666666584 is an abundant number, since it is smaller than the sum of its proper divisors (3543954216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666666584 is a wasteful number, since it uses less digits than its factorization.

1666666584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 1542 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 1666666584 is about 40824.8280339305. The cubic root of 1666666584 is about 1185.6310818943.

The spelling of 1666666584 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred eighty-four".