68260967821 has 2 divisors, whose sum is σ = 68260967822. Its totient is φ = 68260967820.

The previous prime is 68260967809. The next prime is 68260967837. The reversal of 68260967821 is 12876906286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60621333796 + 7639634025 = 246214^2 + 87405^2 .

It is a cyclic number.

It is not a de Polignac number, because 68260967821 - 2⁹ = 68260967309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68260968821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34130483910 + 34130483911.

It is an arithmetic number, because the mean of its divisors is an integer number (34130483911).

Almost surely, 2^68260967821 is an apocalyptic number.

It is an amenable number.

68260967821 is a deficient number, since it is larger than the sum of its proper divisors (1).

68260967821 is an equidigital number, since it uses as much as digits as its factorization.

68260967821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 68260967821 in words is "sixty-eight billion, two hundred sixty million, nine hundred sixty-seven thousand, eight hundred twenty-one".