68517582769 has 2 divisors, whose sum is σ = 68517582770. Its totient is φ = 68517582768.

The previous prime is 68517582733. The next prime is 68517582821. The reversal of 68517582769 is 96728571586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66880166544 + 1637416225 = 258612^2 + 40465^2 .

It is a cyclic number.

It is not a de Polignac number, because 68517582769 - 2⁷ = 68517582641 is a prime.

It is a super-2 number, since 2×68517582769² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68517582769.

It is not a weakly prime, because it can be changed into another prime (68517582709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258791384 + 34258791385.

It is an arithmetic number, because the mean of its divisors is an integer number (34258791385).

Almost surely, 2^68517582769 is an apocalyptic number.

It is an amenable number.

68517582769 is a deficient number, since it is larger than the sum of its proper divisors (1).

68517582769 is an equidigital number, since it uses as much as digits as its factorization.

68517582769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 64.

The spelling of 68517582769 in words is "sixty-eight billion, five hundred seventeen million, five hundred eighty-two thousand, seven hundred sixty-nine".