68365736231521 has 2 divisors, whose sum is σ = 68365736231522. Its totient is φ = 68365736231520.

The previous prime is 68365736231503. The next prime is 68365736231587. The reversal of 68365736231521 is 12513263756386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59616327187921 + 8749409043600 = 7721161^2 + 2957940^2 .

It is a cyclic number.

It is not a de Polignac number, because 68365736231521 - 2⁷ = 68365736231393 is a prime.

It is not a weakly prime, because it can be changed into another prime (68365736231621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34182868115760 + 34182868115761.

It is an arithmetic number, because the mean of its divisors is an integer number (34182868115761).

Almost surely, 2^{68365736231521} is an apocalyptic number.

It is an amenable number.

68365736231521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68365736231521 is an equidigital number, since it uses as much as digits as its factorization.

68365736231521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 58.

The spelling of 68365736231521 in words is "sixty-eight trillion, three hundred sixty-five billion, seven hundred thirty-six million, two hundred thirty-one thousand, five hundred twenty-one".