1641869568 has 144 divisors (see below), whose sum is σ = 5023334400. Its totient is φ = 528353280.

The previous prime is 1641869557. The next prime is 1641869569. The reversal of 1641869568 is 8659681461.

1641869568 is a `hidden beast` number, since 1 + 6 + 4 + 18 + 69 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641869569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196353 + ... + 204543.

Almost surely, 2^1641869568 is an apocalyptic number.

1641869568 is a gapful number since it is divisible by the number (18) 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 1641869568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2511667200).

1641869568 is an abundant number, since it is smaller than the sum of its proper divisors (3381464832).

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

1641869568 is an equidigital number, since it uses as much as digits as its factorization.

1641869568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8245 (or 8225 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 1641869568 is about 40519.9897334637. The cubic root of 1641869568 is about 1179.7216541595.

The spelling of 1641869568 in words is "one billion, six hundred forty-one million, eight hundred sixty-nine thousand, five hundred sixty-eight".