68545540633 has 2 divisors, whose sum is σ = 68545540634. Its totient is φ = 68545540632.

The previous prime is 68545540597. The next prime is 68545540691. The reversal of 68545540633 is 33604554586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66663108864 + 1882431769 = 258192^2 + 43387^2 .

It is a cyclic number.

It is not a de Polignac number, because 68545540633 - 2¹³ = 68545532441 is a prime.

It is a super-2 number, since 2×68545540633² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68545540433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34272770316 + 34272770317.

It is an arithmetic number, because the mean of its divisors is an integer number (34272770317).

Almost surely, 2^68545540633 is an apocalyptic number.

It is an amenable number.

68545540633 is a deficient number, since it is larger than the sum of its proper divisors (1).

68545540633 is an equidigital number, since it uses as much as digits as its factorization.

68545540633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 68545540633 in words is "sixty-eight billion, five hundred forty-five million, five hundred forty thousand, six hundred thirty-three".