1641643332 has 96 divisors (see below), whose sum is σ = 4445548800. Its totient is φ = 461832192.

The previous prime is 1641643303. The next prime is 1641643349. The reversal of 1641643332 is 2333461461.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1641643293 and 1641643302.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1766644 + ... + 1767572.

It is an arithmetic number, because the mean of its divisors is an integer number (46307800).

Almost surely, 2^1641643332 is an apocalyptic number.

1641643332 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 1641643332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222774400).

1641643332 is an abundant number, since it is smaller than the sum of its proper divisors (2803905468).

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

1641643332 is a wasteful number, since it uses less digits than its factorization.

1641643332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245 (or 1243 counting only the distinct ones).

The product of its digits is 31104, while the sum is 33.

The square root of 1641643332 is about 40517.1979781426. The cubic root of 1641643332 is about 1179.6674663862.

The spelling of 1641643332 in words is "one billion, six hundred forty-one million, six hundred forty-three thousand, three hundred thirty-two".