5661859840 has 448 divisors, whose sum is σ = 17615001600. Its totient is φ = 1734082560.

The previous prime is 5661859823. The next prime is 5661859909. The reversal of 5661859840 is 489581665.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 182640625 + ... + 182640655.

It is an arithmetic number, because the mean of its divisors is an integer number (39319200).

Almost surely, 2^5661859840 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 5661859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8807500800).

5661859840 is an abundant number, since it is smaller than the sum of its proper divisors (11953141760).

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

5661859840 is an equidigital number, since it uses as much as digits as its factorization.

5661859840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The square root of 5661859840 is about 75245.3310179442. The cubic root of 5661859840 is about 1782.3228354115.

The spelling of 5661859840 in words is "five billion, six hundred sixty-one million, eight hundred fifty-nine thousand, eight hundred forty".