68495027021 has 2 divisors, whose sum is σ = 68495027022. Its totient is φ = 68495027020.

The previous prime is 68495026981. The next prime is 68495027033. The reversal of 68495027021 is 12072059486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34767704521 + 33727322500 = 186461^2 + 183650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68495027021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68495027071) 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, 34247513510 + 34247513511.

It is an arithmetic number, because the mean of its divisors is an integer number (34247513511).

Almost surely, 2^68495027021 is an apocalyptic number.

It is an amenable number.

68495027021 is a deficient number, since it is larger than the sum of its proper divisors (1).

68495027021 is an equidigital number, since it uses as much as digits as its factorization.

68495027021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 68495027021 in words is "sixty-eight billion, four hundred ninety-five million, twenty-seven thousand, twenty-one".