68141277821 has 2 divisors, whose sum is σ = 68141277822. Its totient is φ = 68141277820.

The previous prime is 68141277751. The next prime is 68141277829. The reversal of 68141277821 is 12877214186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53332821721 + 14808456100 = 230939^2 + 121690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68141277821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68141277829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34070638910 + 34070638911.

It is an arithmetic number, because the mean of its divisors is an integer number (34070638911).

Almost surely, 2^68141277821 is an apocalyptic number.

It is an amenable number.

68141277821 is a deficient number, since it is larger than the sum of its proper divisors (1).

68141277821 is an equidigital number, since it uses as much as digits as its factorization.

68141277821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 301056, while the sum is 47.

The spelling of 68141277821 in words is "sixty-eight billion, one hundred forty-one million, two hundred seventy-seven thousand, eight hundred twenty-one".