68138173837 has 2 divisors, whose sum is σ = 68138173838. Its totient is φ = 68138173836.

The previous prime is 68138173801. The next prime is 68138173861. The reversal of 68138173837 is 73837183186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54566156836 + 13572017001 = 233594^2 + 116499^2 .

It is a cyclic number.

It is not a de Polignac number, because 68138173837 - 2¹⁹ = 68137649549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68138171837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34069086918 + 34069086919.

It is an arithmetic number, because the mean of its divisors is an integer number (34069086919).

Almost surely, 2^68138173837 is an apocalyptic number.

It is an amenable number.

68138173837 is a deficient number, since it is larger than the sum of its proper divisors (1).

68138173837 is an equidigital number, since it uses as much as digits as its factorization.

68138173837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The spelling of 68138173837 in words is "sixty-eight billion, one hundred thirty-eight million, one hundred seventy-three thousand, eight hundred thirty-seven".