5811521640 has 128 divisors (see below), whose sum is σ = 18944409600. Its totient is φ = 1420796160.

The previous prime is 5811521633. The next prime is 5811521669. The reversal of 5811521640 is 461251185.

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, 29569 + ... + 111791.

It is an arithmetic number, because the mean of its divisors is an integer number (148003200).

Almost surely, 2^5811521640 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 5811521640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9472204800).

5811521640 is an abundant number, since it is smaller than the sum of its proper divisors (13132887960).

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

5811521640 is a wasteful number, since it uses less digits than its factorization.

5811521640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82287 (or 82283 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 5811521640 is about 76233.3368022153. The cubic root of 5811521640 is about 1797.8907020618.

The spelling of 5811521640 in words is "five billion, eight hundred eleven million, five hundred twenty-one thousand, six hundred forty".