68138122237 has 2 divisors, whose sum is σ = 68138122238. Its totient is φ = 68138122236.

The previous prime is 68138122211. The next prime is 68138122249. The reversal of 68138122237 is 73222183186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68069331801 + 68790436 = 260901^2 + 8294^2 .

It is a cyclic number.

It is not a de Polignac number, because 68138122237 - 2¹⁵ = 68138089469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68138122193 and 68138122202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68138122037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34069061118 + 34069061119.

It is an arithmetic number, because the mean of its divisors is an integer number (34069061119).

Almost surely, 2^68138122237 is an apocalyptic number.

It is an amenable number.

68138122237 is a deficient number, since it is larger than the sum of its proper divisors (1).

68138122237 is an equidigital number, since it uses as much as digits as its factorization.

68138122237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The spelling of 68138122237 in words is "sixty-eight billion, one hundred thirty-eight million, one hundred twenty-two thousand, two hundred thirty-seven".