68809856394101 has 2 divisors, whose sum is σ = 68809856394102. Its totient is φ = 68809856394100.

The previous prime is 68809856393977. The next prime is 68809856394131. The reversal of 68809856394101 is 10149365890886.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38104138851025 + 30705717543076 = 6172855^2 + 5541274^2 .

It is a cyclic number.

It is not a de Polignac number, because 68809856394101 - 2⁴² = 64411809882997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68809856394131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34404928197050 + 34404928197051.

It is an arithmetic number, because the mean of its divisors is an integer number (34404928197051).

Almost surely, 2^{68809856394101} is an apocalyptic number.

It is an amenable number.

68809856394101 is a deficient number, since it is larger than the sum of its proper divisors (1).

68809856394101 is an equidigital number, since it uses as much as digits as its factorization.

68809856394101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89579520, while the sum is 68.

The spelling of 68809856394101 in words is "sixty-eight trillion, eight hundred nine billion, eight hundred fifty-six million, three hundred ninety-four thousand, one hundred one".