5421809664 has 180 divisors, whose sum is σ = 15887014416. Its totient is φ = 1781465088.

The previous prime is 5421809641. The next prime is 5421809681. The reversal of 5421809664 is 4669081245.

5421809664 is a `hidden beast` number, since 5 + 421 + 80 + 96 + 64 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12238627 + ... + 12239069.

Almost surely, 2^5421809664 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 5421809664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7943507208).

5421809664 is an abundant number, since it is smaller than the sum of its proper divisors (10465204752).

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

5421809664 is an equidigital number, since it uses as much as digits as its factorization.

5421809664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 5421809664 is about 73632.9387163109. The cubic root of 5421809664 is about 1756.7693904110.

The spelling of 5421809664 in words is "five billion, four hundred twenty-one million, eight hundred nine thousand, six hundred sixty-four".