5661521727 has 16 divisors (see below), whose sum is σ = 7597981440. Its totient is φ = 3749745152.

The previous prime is 5661521717. The next prime is 5661521729. The reversal of 5661521727 is 7271251665.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5661521727 - 2⁸ = 5661521471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661521729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649198 + ... + 657860.

It is an arithmetic number, because the mean of its divisors is an integer number (474873840).

Almost surely, 2^5661521727 is an apocalyptic number.

5661521727 is a deficient number, since it is larger than the sum of its proper divisors (1936459713).

5661521727 is a wasteful number, since it uses less digits than its factorization.

5661521727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10062.

The product of its digits is 176400, while the sum is 42.

The square root of 5661521727 is about 75243.0842469924. The cubic root of 5661521727 is about 1782.2873559911.

The spelling of 5661521727 in words is "five billion, six hundred sixty-one million, five hundred twenty-one thousand, seven hundred twenty-seven".