68957557 has 2 divisors, whose sum is σ = 68957558. Its totient is φ = 68957556.

The previous prime is 68957533. The next prime is 68957579. The reversal of 68957557 is 75575986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54774801 + 14182756 = 7401^2 + 3766^2 .

It is a cyclic number.

It is not a de Polignac number, because 68957557 - 2⁷ = 68957429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68957527) 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, 34478778 + 34478779.

It is an arithmetic number, because the mean of its divisors is an integer number (34478779).

Almost surely, 2^68957557 is an apocalyptic number.

It is an amenable number.

68957557 is a deficient number, since it is larger than the sum of its proper divisors (1).

68957557 is an equidigital number, since it uses as much as digits as its factorization.

68957557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646000, while the sum is 52.

The square root of 68957557 is about 8304.0687015462. The cubic root of 68957557 is about 410.0724777680.

The spelling of 68957557 in words is "sixty-eight million, nine hundred fifty-seven thousand, five hundred fifty-seven".