55305661 has 2 divisors, whose sum is σ = 55305662. Its totient is φ = 55305660.

The previous prime is 55305647. The next prime is 55305727. The reversal of 55305661 is 16650355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47183161 + 8122500 = 6869^2 + 2850^2 .

It is a cyclic number.

It is not a de Polignac number, because 55305661 - 2⁷ = 55305533 is a prime.

It is a super-2 number, since 2×55305661² = 6117432277293842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55305461) 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, 27652830 + 27652831.

It is an arithmetic number, because the mean of its divisors is an integer number (27652831).

Almost surely, 2^55305661 is an apocalyptic number.

It is an amenable number.

55305661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55305661 is an equidigital number, since it uses as much as digits as its factorization.

55305661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 55305661 is about 7436.7775951685. Note that the first 3 decimals coincide. The cubic root of 55305661 is about 380.9984385090.

The spelling of 55305661 in words is "fifty-five million, three hundred five thousand, six hundred sixty-one".