5640575661 has 60 divisors (see below), whose sum is σ = 9833694780. Its totient is φ = 3111696000.

The previous prime is 5640575623. The next prime is 5640575693. The reversal of 5640575661 is 1665750465.

5640575661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1918965636 + 3721610025 = 43806^2 + 61005^2 .

It is not a de Polignac number, because 5640575661 - 2²¹ = 5638478509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640573661) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 622161 + ... + 631161.

It is an arithmetic number, because the mean of its divisors is an integer number (163894913).

Almost surely, 2^5640575661 is an apocalyptic number.

It is an amenable number.

5640575661 is a deficient number, since it is larger than the sum of its proper divisors (4193119119).

5640575661 is an equidigital number, since it uses as much as digits as its factorization.

5640575661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9064 (or 9040 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The square root of 5640575661 is about 75103.7659575071. The cubic root of 5640575661 is about 1780.0866495083.

The spelling of 5640575661 in words is "five billion, six hundred forty million, five hundred seventy-five thousand, six hundred sixty-one".