5661125109 has 18 divisors (see below), whose sum is σ = 8449482678. Its totient is φ = 3652333200.

The previous prime is 5661125101. The next prime is 5661125111. The reversal of 5661125109 is 9015211665.

5661125109 is a `hidden beast` number, since 5 + 6 + 611 + 25 + 10 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3940700625 + 1720424484 = 62775^2 + 41478^2 .

It is not a de Polignac number, because 5661125109 - 2³ = 5661125101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661125101) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 318622 + ... + 335919.

Almost surely, 2^5661125109 is an apocalyptic number.

It is an amenable number.

5661125109 is a deficient number, since it is larger than the sum of its proper divisors (2788357569).

5661125109 is a wasteful number, since it uses less digits than its factorization.

5661125109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654609 (or 654575 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 5661125109 is about 75240.4486230644. The cubic root of 5661125109 is about 1782.2457356289.

The spelling of 5661125109 in words is "five billion, six hundred sixty-one million, one hundred twenty-five thousand, one hundred nine".