68738637997 has 2 divisors, whose sum is σ = 68738637998. Its totient is φ = 68738637996.

The previous prime is 68738637991. The next prime is 68738638043. The reversal of 68738637997 is 79973683786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52612431876 + 16126206121 = 229374^2 + 126989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68738637997 is a prime.

It is a super-2 number, since 2×68738637997² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68738637991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34369318998 + 34369318999.

It is an arithmetic number, because the mean of its divisors is an integer number (34369318999).

Almost surely, 2^68738637997 is an apocalyptic number.

It is an amenable number.

68738637997 is a deficient number, since it is larger than the sum of its proper divisors (1).

68738637997 is an equidigital number, since it uses as much as digits as its factorization.

68738637997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576108288, while the sum is 73.

The spelling of 68738637997 in words is "sixty-eight billion, seven hundred thirty-eight million, six hundred thirty-seven thousand, nine hundred ninety-seven".