68657689853 has 2 divisors, whose sum is σ = 68657689854. Its totient is φ = 68657689852.

The previous prime is 68657689811. The next prime is 68657689987. The reversal of 68657689853 is 35898675686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59783673049 + 8874016804 = 244507^2 + 94202^2 .

It is a cyclic number.

It is not a de Polignac number, because 68657689853 - 2¹⁶ = 68657624317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68657689553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34328844926 + 34328844927.

It is an arithmetic number, because the mean of its divisors is an integer number (34328844927).

Almost surely, 2^68657689853 is an apocalyptic number.

It is an amenable number.

68657689853 is a deficient number, since it is larger than the sum of its proper divisors (1).

68657689853 is an equidigital number, since it uses as much as digits as its factorization.

68657689853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 522547200, while the sum is 71.

The spelling of 68657689853 in words is "sixty-eight billion, six hundred fifty-seven million, six hundred eighty-nine thousand, eight hundred fifty-three".