1665632124 has 144 divisors (see below), whose sum is σ = 4757136384. Its totient is φ = 487555200.

The previous prime is 1665632041. The next prime is 1665632173. The reversal of 1665632124 is 4212365661.

1665632124 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 632 + 12 + 4 = 666.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2916759 + ... + 2917329.

Almost surely, 2^1665632124 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 1665632124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2378568192).

1665632124 is an abundant number, since it is smaller than the sum of its proper divisors (3091504260).

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

1665632124 is a wasteful number, since it uses less digits than its factorization.

1665632124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 883 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1665632124 is about 40812.1565712963. The cubic root of 1665632124 is about 1185.3857335287.

Adding to 1665632124 its reverse (4212365661), we get a palindrome (5877997785).

The spelling of 1665632124 in words is "one billion, six hundred sixty-five million, six hundred thirty-two thousand, one hundred twenty-four".