68355869 has 2 divisors, whose sum is σ = 68355870. Its totient is φ = 68355868.

The previous prime is 68355823. The next prime is 68355893. The reversal of 68355869 is 96855386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67453369 + 902500 = 8213^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 68355869 - 2¹⁶ = 68290333 is a prime.

It is a super-2 number, since 2×68355869² = 9345049653490322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68355809) 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, 34177934 + 34177935.

It is an arithmetic number, because the mean of its divisors is an integer number (34177935).

Almost surely, 2^68355869 is an apocalyptic number.

It is an amenable number.

68355869 is a deficient number, since it is larger than the sum of its proper divisors (1).

68355869 is an equidigital number, since it uses as much as digits as its factorization.

68355869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 50.

The square root of 68355869 is about 8267.7608214075. The cubic root of 68355869 is about 408.8762984165.

It can be divided in two parts, 68355 and 869, that multiplied together give a palindrome (59400495).

The spelling of 68355869 in words is "sixty-eight million, three hundred fifty-five thousand, eight hundred sixty-nine".