68904493813 has 2 divisors, whose sum is σ = 68904493814. Its totient is φ = 68904493812.

The previous prime is 68904493793. The next prime is 68904493877. The reversal of 68904493813 is 31839440986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51848656209 + 17055837604 = 227703^2 + 130598^2 .

It is a cyclic number.

It is not a de Polignac number, because 68904493813 - 2⁵ = 68904493781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68904490813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34452246906 + 34452246907.

It is an arithmetic number, because the mean of its divisors is an integer number (34452246907).

Almost surely, 2^68904493813 is an apocalyptic number.

It is an amenable number.

68904493813 is a deficient number, since it is larger than the sum of its proper divisors (1).

68904493813 is an equidigital number, since it uses as much as digits as its factorization.

68904493813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 68904493813 in words is "sixty-eight billion, nine hundred four million, four hundred ninety-three thousand, eight hundred thirteen".