68648084639 has 2 divisors, whose sum is σ = 68648084640. Its totient is φ = 68648084638.

The previous prime is 68648084629. The next prime is 68648084719. The reversal of 68648084639 is 93648084686.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68648084639 is a prime.

It is a super-3 number, since 3×68648084639³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68648084629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34324042319 + 34324042320.

It is an arithmetic number, because the mean of its divisors is an integer number (34324042320).

Almost surely, 2^68648084639 is an apocalyptic number.

68648084639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68648084639 is an equidigital number, since it uses as much as digits as its factorization.

68648084639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47775744, while the sum is 62.

The spelling of 68648084639 in words is "sixty-eight billion, six hundred forty-eight million, eighty-four thousand, six hundred thirty-nine".