55761661 has 2 divisors, whose sum is σ = 55761662. Its totient is φ = 55761660.

The previous prime is 55761631. The next prime is 55761679. The reversal of 55761661 is 16616755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44970436 + 10791225 = 6706^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 55761661 - 2⁹ = 55761149 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55761661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55761631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27880830 + 27880831.

It is an arithmetic number, because the mean of its divisors is an integer number (27880831).

Almost surely, 2^55761661 is an apocalyptic number.

It is an amenable number.

55761661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55761661 is an equidigital number, since it uses as much as digits as its factorization.

55761661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 55761661 is about 7467.3730990222. The cubic root of 55761661 is about 382.0426955376.

The spelling of 55761661 in words is "fifty-five million, seven hundred sixty-one thousand, six hundred sixty-one".