68665582571 has 2 divisors, whose sum is σ = 68665582572. Its totient is φ = 68665582570.

The previous prime is 68665582549. The next prime is 68665582603. The reversal of 68665582571 is 17528556686.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68665582571 - 2¹⁰ = 68665581547 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68665582571.

It is not a weakly prime, because it can be changed into another prime (68665582501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34332791285 + 34332791286.

It is an arithmetic number, because the mean of its divisors is an integer number (34332791286).

Almost surely, 2^68665582571 is an apocalyptic number.

68665582571 is a deficient number, since it is larger than the sum of its proper divisors (1).

68665582571 is an equidigital number, since it uses as much as digits as its factorization.

68665582571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192000, while the sum is 59.

The spelling of 68665582571 in words is "sixty-eight billion, six hundred sixty-five million, five hundred eighty-two thousand, five hundred seventy-one".