1664543124 has 36 divisors (see below), whose sum is σ = 4321317364. Its totient is φ = 539851392.

The previous prime is 1664543071. The next prime is 1664543141. The reversal of 1664543124 is 4213454661.

1664543124 is a `hidden beast` number, since 1 + 6 + 645 + 4 + 3 + 1 + 2 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1030410000 + 634133124 = 32100^2 + 25182^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 623497 + ... + 626160.

Almost surely, 2^1664543124 is an apocalyptic number.

It is an amenable number.

1664543124 is an abundant number, since it is smaller than the sum of its proper divisors (2656774240).

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

1664543124 is a wasteful number, since it uses less digits than its factorization.

1664543124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249704 (or 1249699 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 1664543124 is about 40798.8127768444. The cubic root of 1664543124 is about 1185.1273398380.

Adding to 1664543124 its reverse (4213454661), we get a palindrome (5877997785).

The spelling of 1664543124 in words is "one billion, six hundred sixty-four million, five hundred forty-three thousand, one hundred twenty-four".