68802557 has 2 divisors, whose sum is σ = 68802558. Its totient is φ = 68802556.

The previous prime is 68802527. The next prime is 68802563. The reversal of 68802557 is 75520886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68128516 + 674041 = 8254^2 + 821^2 .

It is a cyclic number.

It is not a de Polignac number, because 68802557 - 2⁶ = 68802493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68802527) 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, 34401278 + 34401279.

It is an arithmetic number, because the mean of its divisors is an integer number (34401279).

Almost surely, 2^68802557 is an apocalyptic number.

It is an amenable number.

68802557 is a deficient number, since it is larger than the sum of its proper divisors (1).

68802557 is an equidigital number, since it uses as much as digits as its factorization.

68802557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 68802557 is about 8294.7306767610. The cubic root of 68802557 is about 409.7649991786.

The spelling of 68802557 in words is "sixty-eight million, eight hundred two thousand, five hundred fifty-seven".