1643453416 has 64 divisors (see below), whose sum is σ = 3417163200. Its totient is φ = 734784000.

The previous prime is 1643453411. The next prime is 1643453417. The reversal of 1643453416 is 6143543461.

It is a super-3 number, since 3×1643453416³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1643453411) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1590436 + ... + 1591468.

It is an arithmetic number, because the mean of its divisors is an integer number (53393175).

Almost surely, 2^1643453416 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 1643453416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1708581600).

1643453416 is an abundant number, since it is smaller than the sum of its proper divisors (1773709784).

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

1643453416 is a wasteful number, since it uses less digits than its factorization.

1643453416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1326 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 1643453416 is about 40539.5290549853. The cubic root of 1643453416 is about 1180.1008761792.

Adding to 1643453416 its reverse (6143543461), we get a palindrome (7786996877).

It can be divided in two parts, 164345 and 3416, that added together give a palindrome (167761).

The spelling of 1643453416 in words is "one billion, six hundred forty-three million, four hundred fifty-three thousand, four hundred sixteen".