55717657 has 2 divisors, whose sum is σ = 55717658. Its totient is φ = 55717656.

The previous prime is 55717631. The next prime is 55717667. The reversal of 55717657 is 75671755.

55717657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55071241 + 646416 = 7421^2 + 804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55717657 is a prime.

It is not a weakly prime, because it can be changed into another prime (55717667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27858828 + 27858829.

It is an arithmetic number, because the mean of its divisors is an integer number (27858829).

Almost surely, 2^55717657 is an apocalyptic number.

It is an amenable number.

55717657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55717657 is an equidigital number, since it uses as much as digits as its factorization.

55717657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 257250, while the sum is 43.

The square root of 55717657 is about 7464.4260998418. The cubic root of 55717657 is about 381.9421734786.

The spelling of 55717657 in words is "fifty-five million, seven hundred seventeen thousand, six hundred fifty-seven".