68036779457 has 2 divisors, whose sum is σ = 68036779458. Its totient is φ = 68036779456.

The previous prime is 68036779453. The next prime is 68036779519. The reversal of 68036779457 is 75497763086.

It is an a-pointer prime, because the next prime (68036779519) can be obtained adding 68036779457 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51785374096 + 16251405361 = 227564^2 + 127481^2 .

It is a cyclic number.

It is not a de Polignac number, because 68036779457 - 2² = 68036779453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68036779457.

It is not a weakly prime, because it can be changed into another prime (68036779453) 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, 34018389728 + 34018389729.

It is an arithmetic number, because the mean of its divisors is an integer number (34018389729).

Almost surely, 2^68036779457 is an apocalyptic number.

It is an amenable number.

68036779457 is a deficient number, since it is larger than the sum of its proper divisors (1).

68036779457 is an equidigital number, since it uses as much as digits as its factorization.

68036779457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53343360, while the sum is 62.

The spelling of 68036779457 in words is "sixty-eight billion, thirty-six million, seven hundred seventy-nine thousand, four hundred fifty-seven".