68738621641 has 2 divisors, whose sum is σ = 68738621642. Its totient is φ = 68738621640.

The previous prime is 68738621587. The next prime is 68738621647. The reversal of 68738621641 is 14612683786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53898265600 + 14840356041 = 232160^2 + 121821^2 .

It is a cyclic number.

It is not a de Polignac number, because 68738621641 - 2³¹ = 66591137993 is a prime.

It is not a weakly prime, because it can be changed into another prime (68738621647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34369310820 + 34369310821.

It is an arithmetic number, because the mean of its divisors is an integer number (34369310821).

Almost surely, 2^68738621641 is an apocalyptic number.

It is an amenable number.

68738621641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68738621641 is an equidigital number, since it uses as much as digits as its factorization.

68738621641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 52.

The spelling of 68738621641 in words is "sixty-eight billion, seven hundred thirty-eight million, six hundred twenty-one thousand, six hundred forty-one".