5661744840 has 48 divisors (see below), whose sum is σ = 18400671900. Its totient is φ = 1509798528.

The previous prime is 5661744827. The next prime is 5661744841. The reversal of 5661744840 is 484471665.

5661744840 is a `hidden beast` number, since 566 + 1 + 7 + 4 + 4 + 84 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5651130276 + 10614564 = 75174^2 + 3258^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (5661744841) 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, 7863175 + ... + 7863894.

Almost surely, 2^5661744840 is an apocalyptic number.

It is an amenable number.

5661744840 is an abundant number, since it is smaller than the sum of its proper divisors (12738927060).

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

5661744840 is a wasteful number, since it uses less digits than its factorization.

5661744840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15727086 (or 15727079 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 5661744840 is about 75244.5668470488. The cubic root of 5661744840 is about 1782.3107682039.

The spelling of 5661744840 in words is "five billion, six hundred sixty-one million, seven hundred forty-four thousand, eight hundred forty".