68205521071 has 2 divisors, whose sum is σ = 68205521072. Its totient is φ = 68205521070.

The previous prime is 68205521039. The next prime is 68205521077. The reversal of 68205521071 is 17012550286.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68205521071 - 2⁵ = 68205521039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68205521071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68205521077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34102760535 + 34102760536.

It is an arithmetic number, because the mean of its divisors is an integer number (34102760536).

Almost surely, 2^68205521071 is an apocalyptic number.

68205521071 is a deficient number, since it is larger than the sum of its proper divisors (1).

68205521071 is an equidigital number, since it uses as much as digits as its factorization.

68205521071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 68205521071 in words is "sixty-eight billion, two hundred five million, five hundred twenty-one thousand, seventy-one".