55666757 has 2 divisors, whose sum is σ = 55666758. Its totient is φ = 55666756.

The previous prime is 55666727. The next prime is 55666763. The reversal of 55666757 is 75766655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52548001 + 3118756 = 7249^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 55666757 - 2²⁰ = 54618181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55666717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833378 + 27833379.

It is an arithmetic number, because the mean of its divisors is an integer number (27833379).

Almost surely, 2^55666757 is an apocalyptic number.

It is an amenable number.

55666757 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666757 is an equidigital number, since it uses as much as digits as its factorization.

55666757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 47.

The square root of 55666757 is about 7461.0158155576. The cubic root of 55666757 is about 381.8258322644.

The spelling of 55666757 in words is "fifty-five million, six hundred sixty-six thousand, seven hundred fifty-seven".