1665632112 has 80 divisors (see below), whose sum is σ = 4538400000. Its totient is φ = 524938752.

The previous prime is 1665632041. The next prime is 1665632173. The reversal of 1665632112 is 2112365661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544764 + ... + 547812.

It is an arithmetic number, because the mean of its divisors is an integer number (56730000).

Almost surely, 2^1665632112 is an apocalyptic number.

1665632112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665632112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2269200000).

1665632112 is an abundant number, since it is smaller than the sum of its proper divisors (2872767888).

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

1665632112 is a wasteful number, since it uses less digits than its factorization.

1665632112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678 (or 3672 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 1665632112 is about 40812.1564242812. The cubic root of 1665632112 is about 1185.3857306820.

Adding to 1665632112 its reverse (2112365661), we get a palindrome (3777997773).

The spelling of 1665632112 in words is "one billion, six hundred sixty-five million, six hundred thirty-two thousand, one hundred twelve".