5661551611 has 2 divisors, whose sum is σ = 5661551612. Its totient is φ = 5661551610.

The previous prime is 5661551549. The next prime is 5661551629. The reversal of 5661551611 is 1161551665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5661551611 - 2⁹ = 5661551099 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661551681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830775805 + 2830775806.

It is an arithmetic number, because the mean of its divisors is an integer number (2830775806).

Almost surely, 2^5661551611 is an apocalyptic number.

5661551611 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661551611 is an equidigital number, since it uses as much as digits as its factorization.

5661551611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 37.

The square root of 5661551611 is about 75243.2828297649. The cubic root of 5661551611 is about 1782.2904918842.

The spelling of 5661551611 in words is "five billion, six hundred sixty-one million, five hundred fifty-one thousand, six hundred eleven".