5661551629 has 2 divisors, whose sum is σ = 5661551630. Its totient is φ = 5661551628.

The previous prime is 5661551611. The next prime is 5661551681. The reversal of 5661551629 is 9261551665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3589208100 + 2072343529 = 59910^2 + 45523^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661551629 - 2¹¹ = 5661549581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661554629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830775814 + 2830775815.

It is an arithmetic number, because the mean of its divisors is an integer number (2830775815).

Almost surely, 2^5661551629 is an apocalyptic number.

It is an amenable number.

5661551629 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661551629 is an equidigital number, since it uses as much as digits as its factorization.

5661551629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 46.

The square root of 5661551629 is about 75243.2829493769. The cubic root of 5661551629 is about 1782.2904937731.

The spelling of 5661551629 in words is "five billion, six hundred sixty-one million, five hundred fifty-one thousand, six hundred twenty-nine".