68361788716421 has 2 divisors, whose sum is σ = 68361788716422. Its totient is φ = 68361788716420.

The previous prime is 68361788716399. The next prime is 68361788716453. The reversal of 68361788716421 is 12461788716386.

68361788716421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66060238785025 + 2301549931396 = 8127745^2 + 1517086^2 .

It is a cyclic number.

It is not a de Polignac number, because 68361788716421 - 2²² = 68361784522117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68361788716471) 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, 34180894358210 + 34180894358211.

It is an arithmetic number, because the mean of its divisors is an integer number (34180894358211).

Almost surely, 2^{68361788716421} is an apocalyptic number.

It is an amenable number.

68361788716421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68361788716421 is an equidigital number, since it uses as much as digits as its factorization.

68361788716421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130056192, while the sum is 68.

The spelling of 68361788716421 in words is "sixty-eight trillion, three hundred sixty-one billion, seven hundred eighty-eight million, seven hundred sixteen thousand, four hundred twenty-one".