68129113687 has 2 divisors, whose sum is σ = 68129113688. Its totient is φ = 68129113686.

The previous prime is 68129113631. The next prime is 68129113693. The reversal of 68129113687 is 78631192186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68129113687 is a prime.

It is a super-2 number, since 2×68129113687² (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 (68129113607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34064556843 + 34064556844.

It is an arithmetic number, because the mean of its divisors is an integer number (34064556844).

Almost surely, 2^68129113687 is an apocalyptic number.

68129113687 is a deficient number, since it is larger than the sum of its proper divisors (1).

68129113687 is an equidigital number, since it uses as much as digits as its factorization.

68129113687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 52.

The spelling of 68129113687 in words is "sixty-eight billion, one hundred twenty-nine million, one hundred thirteen thousand, six hundred eighty-seven".