68494499609 has 2 divisors, whose sum is σ = 68494499610. Its totient is φ = 68494499608.

The previous prime is 68494499561. The next prime is 68494499651. The reversal of 68494499609 is 90699449486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55951171600 + 12543328009 = 236540^2 + 111997^2 .

It is a cyclic number.

It is not a de Polignac number, because 68494499609 - 2¹² = 68494495513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68494499669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34247249804 + 34247249805.

It is an arithmetic number, because the mean of its divisors is an integer number (34247249805).

Almost surely, 2^68494499609 is an apocalyptic number.

It is an amenable number.

68494499609 is a deficient number, since it is larger than the sum of its proper divisors (1).

68494499609 is an equidigital number, since it uses as much as digits as its factorization.

68494499609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120932352, while the sum is 68.

The spelling of 68494499609 in words is "sixty-eight billion, four hundred ninety-four million, four hundred ninety-nine thousand, six hundred nine".