68398440769 has 2 divisors, whose sum is σ = 68398440770. Its totient is φ = 68398440768.

The previous prime is 68398440763. The next prime is 68398440787. The reversal of 68398440769 is 96704489386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67554247744 + 844193025 = 259912^2 + 29055^2 .

It is a cyclic number.

It is not a de Polignac number, because 68398440769 - 2¹¹ = 68398438721 is a prime.

It is a super-2 number, since 2×68398440769² (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 68398440769.

It is not a weakly prime, because it can be changed into another prime (68398440763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34199220384 + 34199220385.

It is an arithmetic number, because the mean of its divisors is an integer number (34199220385).

Almost surely, 2^68398440769 is an apocalyptic number.

It is an amenable number.

68398440769 is a deficient number, since it is larger than the sum of its proper divisors (1).

68398440769 is an equidigital number, since it uses as much as digits as its factorization.

68398440769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62705664, while the sum is 64.

The spelling of 68398440769 in words is "sixty-eight billion, three hundred ninety-eight million, four hundred forty thousand, seven hundred sixty-nine".