68553557 has 2 divisors, whose sum is σ = 68553558. Its totient is φ = 68553556.

The previous prime is 68553521. The next prime is 68553581. The reversal of 68553557 is 75535586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44209201 + 24344356 = 6649^2 + 4934^2 .

It is a cyclic number.

It is not a de Polignac number, because 68553557 - 2⁸ = 68553301 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68553157) 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, 34276778 + 34276779.

It is an arithmetic number, because the mean of its divisors is an integer number (34276779).

Almost surely, 2^68553557 is an apocalyptic number.

It is an amenable number.

68553557 is a deficient number, since it is larger than the sum of its proper divisors (1).

68553557 is an equidigital number, since it uses as much as digits as its factorization.

68553557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630000, while the sum is 44.

The square root of 68553557 is about 8279.7075431443. The cubic root of 68553557 is about 409.2700814359.

The spelling of 68553557 in words is "sixty-eight million, five hundred fifty-three thousand, five hundred fifty-seven".