68220049861 has 2 divisors, whose sum is σ = 68220049862. Its totient is φ = 68220049860.

The previous prime is 68220049823. The next prime is 68220049867. The reversal of 68220049861 is 16894002286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54950392225 + 13269657636 = 234415^2 + 115194^2 .

It is a cyclic number.

It is not a de Polignac number, because 68220049861 - 2⁹ = 68220049349 is a prime.

It is a super-2 number, since 2×68220049861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68220049867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34110024930 + 34110024931.

It is an arithmetic number, because the mean of its divisors is an integer number (34110024931).

Almost surely, 2^68220049861 is an apocalyptic number.

It is an amenable number.

68220049861 is a deficient number, since it is larger than the sum of its proper divisors (1).

68220049861 is an equidigital number, since it uses as much as digits as its factorization.

68220049861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 68220049861 in words is "sixty-eight billion, two hundred twenty million, forty-nine thousand, eight hundred sixty-one".