68173644290281 has 2 divisors, whose sum is σ = 68173644290282. Its totient is φ = 68173644290280.

The previous prime is 68173644290273. The next prime is 68173644290287. The reversal of 68173644290281 is 18209244637186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40890154600681 + 27283489689600 = 6394541^2 + 5223360^2 .

It is a cyclic number.

It is not a de Polignac number, because 68173644290281 - 2³ = 68173644290273 is a prime.

It is a super-2 number, since 2×68173644290281² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68173644290287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34086822145140 + 34086822145141.

It is an arithmetic number, because the mean of its divisors is an integer number (34086822145141).

Almost surely, 2^{68173644290281} is an apocalyptic number.

It is an amenable number.

68173644290281 is a deficient number, since it is larger than the sum of its proper divisors (1).

68173644290281 is an equidigital number, since it uses as much as digits as its factorization.

68173644290281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 68173644290281 in words is "sixty-eight trillion, one hundred seventy-three billion, six hundred forty-four million, two hundred ninety thousand, two hundred eighty-one".