4321649664 has 132 divisors (see below), whose sum is σ = 12533142336. Its totient is φ = 1434267648.

The previous prime is 4321649663. The next prime is 4321649669. The reversal of 4321649664 is 4669461234.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4321649663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2422917 + ... + 2424699.

It is an arithmetic number, because the mean of its divisors is an integer number (94948048).

Almost surely, 2^4321649664 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 4321649664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6266571168).

4321649664 is an abundant number, since it is smaller than the sum of its proper divisors (8211492672).

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

4321649664 is a wasteful number, since it uses less digits than its factorization.

4321649664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072 (or 2051 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 4321649664 is about 65739.2551220350. The cubic root of 4321649664 is about 1628.8578526958.

The spelling of 4321649664 in words is "four billion, three hundred twenty-one million, six hundred forty-nine thousand, six hundred sixty-four".